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Sound Powered Telephone, Voice Tube, and Engine Order Telegraph Systems | Midpage
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Code of Federal Regulations
Title 46
Chapter I
Subchapter D
Part 32
Subpart 32.30
Sound Powered Telephone, Voice Tube, and Engine Order Telegraph Systems
32.30-1
Voice tubes or telephone equipment—T/ALL.
32.30-5
Engine order telegraph equipment—T/ALL.