get_hardware_revision
Description:
Gets the equipment hardware revision, as reported by this Modem.
Warning: 
      
        
    
    The returned value is only valid until the property changes so it is only safe to use this function on the thread where this was constructed. Use dup_hardware_revision if on another thread.
Parameters:
| this | A Modem. | 
Returns:
| The equipment hardware revision, or  |