Bell signal; mechanical telegraph
NSN 4140-01-138-3045
NSN 5950-01-473-9352
NSN 5999-00-290-5898
NSN 5965-01-331-1644
NSN 5965-01-149-8000
NSN 6620-01-158-9412
NSN 5925-01-459-6955
NSN 6105-00-042-4469
NSN 2925-01-271-8727
NSN 5915-01-239-8931
NSN 5999-01-044-5417
NSN 6240-00-435-0433
Last Updated: 06/28/2025