Original Molsheim Pitman Arm ( Barre d'accouplement des fusées ).It is 65 cm long from end of thread, to end of thread at the other end.The diametre of the rod is 20 mm.
SONABEL Type BOF Horn Compressor, 6V I guess for a complete horn you also need the pneumatic horns, that would be connected using a firm hose to the outlet of the compressor.