diff --git a/EGkArcSpecial.h b/EGkArcSpecial.h
index 2f9237e..941388a 100644
--- a/EGkArcSpecial.h
+++ b/EGkArcSpecial.h
@@ -1,13 +1,14 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2014-2022
+//  EgalTech 2014-2023
 //----------------------------------------------------------------------------
-// File : EGkArcSpecial.h       Data : 20.12.22         Versione : 2.4l3
+// File : EGkArcSpecial.h       Data : 04.08.23         Versione : 2.5h1
 // Contenuto : Dichiarazione funzioni per calcolo speciale archi.
 //
 //
 //
 // Modifiche : 12.06.14 DS Creazione modulo.
 //             20.12.22 DS Aggiunta GetArc2PCN.
+//             04.08.23 DS Aggiunta GetArc2PNB.
 //
 //----------------------------------------------------------------------------
 
@@ -27,5 +28,6 @@
 //----------------------------------------------------------------------------
 EGK_EXPORT ICurve* GetArc2PD( const Point3d& ptStart, const Point3d& ptEnd, double dDirStartDeg) ;
 EGK_EXPORT ICurve* GetArc2PVN( const Point3d& ptStart, const Point3d& ptEnd, const Vector3d& vtDirS, const Vector3d& vtN) ;
+EGK_EXPORT ICurve* GetArc2PNB( const Point3d& ptStart, const Point3d& ptEnd, const Vector3d& vtN, double dBulge) ;
 EGK_EXPORT ICurve* GetArc3P( const Point3d& ptStart, const Point3d& ptOther, const Point3d& ptEnd, bool bCirc) ;
 EGK_EXPORT ICurveArc* GetArc2PCN( const Point3d& ptStart, const Point3d& ptEnd, const Point3d& ptNearCen, const Vector3d& vtN) ;
diff --git a/EGkCurveLine.h b/EGkCurveLine.h
index 8ab95f0..380c10a 100644
--- a/EGkCurveLine.h
+++ b/EGkCurveLine.h
@@ -45,3 +45,10 @@ inline ICurveLine* GetCurveLine( IGeoObj* pGObj)
                { if ( pGObj == nullptr  ||  pGObj->GetType() != CRV_LINE)
                    return nullptr ;
                  return (static_cast<ICurveLine*>(pGObj)) ; }
+
+//----------------------------------------------------------------------------
+// Raccolte di puntatori a ICurveLine
+typedef std::vector<const ICurveLine*>    CICRVLINEVECTOR ;    // vettore di puntatori a const ICurveLine
+typedef std::vector<ICurveLine*>          ICRVLINEPVECTOR ;    // vettore di puntatori a ICurveLine
+typedef std::list<ICurveLine*>            ICRVLINEPLIST ;      // lista di puntatori a ICurveLine
+typedef std::vector<PtrOwner<ICurveLine>> ICRVLINEPOVECTOR ;   // vettore di puntatori esclusivi a ICurveLine
diff --git a/EGkPoint3d.h b/EGkPoint3d.h
index 3d23f4c..eb82b46 100644
--- a/EGkPoint3d.h
+++ b/EGkPoint3d.h
@@ -1,12 +1,13 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2022
+//  EgalTech 2013-2023
 //----------------------------------------------------------------------------
-// File : EGkPoint3d.h           Data : 22.08.224          Versione : 2.4h2
+// File : EGkPoint3d.h           Data : 23.08.23          Versione : 2.5h2
 // Contenuto : Dichiarazione della classe Punto 3d.
 //
 //
 //
 // Modifiche : 30.12.12 DS Creazione modulo.
+//             23.08.23 DS Aggiunto P_INVALID.
 //
 //
 //----------------------------------------------------------------------------
@@ -99,6 +100,8 @@ class EGK_EXPORT Point3d
 //----------------------------------------------------------------------------
 // Punti notevoli
 //----------------------------------------------------------------------------
+//! Punto non valido
+const Point3d P_INVALID( NAN, NAN, NAN) ;
 //! Punto origine
 const Point3d ORIG( 0, 0, 0) ;
 
diff --git a/EGkVector3d.h b/EGkVector3d.h
index a4f0f69..2dc1764 100644
--- a/EGkVector3d.h
+++ b/EGkVector3d.h
@@ -1,13 +1,14 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2013-2022
+//  EgalTech 2013-2023
 //----------------------------------------------------------------------------
-// File : EGkVector3d.h          Data : 27.08.22          Versione : 2.4h2
+// File : EGkVector3d.h          Data : 23.08.23          Versione : 2.5h2
 // Contenuto : Dichiarazione della classe Vettore 3d.
 //
 //
 //
 // Modifiche : 31.12.13 DS Creazione modulo.
 //             14.12.19 DS Aggiunti confronti con Epsilon.
+//             23.08.23 DS Aggiunto V_INVALID.
 //
 //----------------------------------------------------------------------------
 
@@ -170,6 +171,8 @@ class EGK_EXPORT Vector3d
 //----------------------------------------------------------------------------
 // Vettori notevoli
 //----------------------------------------------------------------------------
+//! Vettore non valido
+const Vector3d V_INVALID( NAN, NAN, NAN) ;
 //! Vettore nullo
 const Vector3d V_NULL( 0, 0, 0) ;
 //! Versore asse X
diff --git a/EInAPI.h b/EInAPI.h
index 10b24fb..a8a0b25 100644
--- a/EInAPI.h
+++ b/EInAPI.h
@@ -716,6 +716,7 @@ EIN_EXPORT int  __stdcall EgtGetLastMachGroup( void) ;
 EIN_EXPORT int  __stdcall EgtGetPrevMachGroup( int nId) ;
 EIN_EXPORT BOOL __stdcall EgtGetMachGroupNewName( const wchar_t* wsName, wchar_t*& wsNewName) ;
 EIN_EXPORT int  __stdcall EgtAddMachGroup( const wchar_t* wsName, const wchar_t* wsMachineName) ;
+EIN_EXPORT int  __stdcall EgtCopyMachGroup( const wchar_t* wsSouName, const wchar_t* wsName) ;
 EIN_EXPORT BOOL __stdcall EgtRemoveMachGroup( int nMGroupId) ;
 EIN_EXPORT BOOL __stdcall EgtGetMachGroupName( int nMGroupId, wchar_t*& wsName) ;
 EIN_EXPORT BOOL __stdcall EgtGetMachGroupMachineName( int nMGroupId, wchar_t*& wsMachineName) ;
diff --git a/EMkMachMgr.h b/EMkMachMgr.h
index aa95c54..a9c3de7 100644
--- a/EMkMachMgr.h
+++ b/EMkMachMgr.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2015-2022
+//  EgalTech 2015-2023
 //----------------------------------------------------------------------------
-// File : EMkMachMgr.h           Data : 21.09.22          Versione : 2.4i4
+// File : EMkMachMgr.h           Data : 25.08.23          Versione : 2.5h3
 // Contenuto : Dichiarazione della interfaccia IMachMgr.
 //
 //
@@ -13,6 +13,7 @@
 //             10.11.20 DS Portate in interfaccia funzioni di calcolo con vettori di angoli.
 //             13.01.21 DS Aggiunte in interfaccia GetCalcHead e GetCalcExit.
 //             21.09.22 DS Aggiunta in interfaccia GetAxisOffset.
+//             25.08.23 DS Aggiunta in interfaccia CopyMachGroup.
 //
 //----------------------------------------------------------------------------
 
@@ -57,6 +58,7 @@ class __declspec( novtable) IMachMgr
       virtual int  GetPrevMachGroup( int nId) const = 0 ;
       virtual bool GetMachGroupNewName( std::string& sName) const = 0 ;
       virtual int  AddMachGroup( const std::string& sName, const std::string& sMachineName) = 0 ;
+      virtual int  CopyMachGroup( const std::string& sSouName, const std::string& sName) = 0 ;
       virtual bool RemoveMachGroup( int nId) = 0 ;
       virtual std::string GetMachGroupName( int nId) const = 0 ;
       virtual std::string GetMachGroupMachineName( int nId) const = 0 ;
diff --git a/EXeExecutor.h b/EXeExecutor.h
index 6e4fe61..5b3d748 100644
--- a/EXeExecutor.h
+++ b/EXeExecutor.h
@@ -267,6 +267,8 @@ EXE_EXPORT int  ExeCreateArcC2PEx( int nParentId, const Point3d& ptCen,
                                    const Point3d& ptNearEnd, int nRefType) ;
 EXE_EXPORT int  ExeCreateArc3P( int nParentId, const Point3d& ptP1,
                                 const Point3d& ptP2, const Point3d& ptP3, int nRefType) ;
+EXE_EXPORT int  ExeCreateArc2PB( int nParentId, const Point3d& ptStart, const Point3d& ptEnd,
+                                 double dBulge, int nRefType) ;
 EXE_EXPORT int  ExeCreateArc2PD( int nParentId, const Point3d& ptStart, const Point3d& ptEnd,
                                  double dDirSDeg, int nRefType) ;
 EXE_EXPORT int  ExeCreateArc2PDEx( int nParentId, const Point3d& ptStart,
@@ -898,6 +900,7 @@ EXE_EXPORT int  ExeGetLastMachGroup( void) ;
 EXE_EXPORT int  ExeGetPrevMachGroup( int nId) ;
 EXE_EXPORT bool ExeGetMachGroupNewName( std::string& sName) ;
 EXE_EXPORT int  ExeAddMachGroup( const std::string& sName, const std::string& sMachineName) ;
+EXE_EXPORT int  ExeCopyMachGroup( const std::string& sSouName, const std::string& sName) ;
 EXE_EXPORT bool ExeRemoveMachGroup( int nMGroupId) ;
 EXE_EXPORT bool ExeGetMachGroupName( int nId, std::string& sName) ;
 EXE_EXPORT bool ExeGetMachGroupMachineName( int nId, std::string& sMachineName) ;
diff --git a/EgtNumUtils.h b/EgtNumUtils.h
index 7b229d5..a43ed9f 100644
--- a/EgtNumUtils.h
+++ b/EgtNumUtils.h
@@ -1,7 +1,7 @@
 //----------------------------------------------------------------------------
-//  EgalTech 2016-2018
+//  EgalTech 2016-2023
 //----------------------------------------------------------------------------
-// File : EgtNumUtils.h       Data : 05.11.16         Versione : 1.6w1
+// File : EgtNumUtils.h       Data : 16.08.23         Versione : 2.5h2
 // Contenuto : Funzioni numeriche di base.       
 //
 //
@@ -17,14 +17,14 @@
 inline
 int Clamp( int nVal, int nMin, int nMax)
 {
-   return ( nVal < nMin ? nMin : nMax < nVal ? nMax : nVal) ;
+   return ( nVal < nMin ? nMin : ( nVal > nMax ? nMax : nVal)) ;
 }
 
 //----------------------------------------------------------------------------
 inline
 double Clamp( double dVal, double dMin, double dMax)
 {
-   return ( dVal < dMin ? dMin : dMax < dVal ? dMax : dVal) ;
+   return ( dVal < dMin ? dMin : ( dVal > dMax ? dMax : dVal)) ;
 }
 
 //----------------------------------------------------------------------------