Bell signal; mechanical telegraph
NSN 6620-00-008-3280
NSN 5905-01-578-6998
NSN 2925-01-131-0469
NSN 5950-00-099-9612
NSN 5835-01-069-2359
NSN 5920-01-634-0250
NSN 7035-00-803-3056
NSN 6685-01-230-3907
NSN 6130-01-388-9961
NSN 5920-01-333-7523
NSN 6610-01-391-6781
NSN 2925-00-535-0372
Last Updated: 06/05/2025