Original custom object data format (DXF group 70).
https://help.autodesk.com/view/OARX/2024/ENU/?guid=GUID-89A690F9-E859-4D57-89EA-750F3FB76C6B
Original custom object data format (DXF group 70).
See
https://help.autodesk.com/view/OARX/2024/ENU/?guid=GUID-89A690F9-E859-4D57-89EA-750F3FB76C6B