| pe_unit_clone | 
Creates a new unit of measure object from an existing one
PE_UNIT pe_unit_clone (PE_UNIT unit);
| unit | The pointer to an existing unit of measure object | 
This function creates a duplicate unit of measure from an existing unit of measure object.
On success, the new unit; on failure, a null pointer
PE_UNIT dd2 = pe_unit_clone(dd);