BD-14

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40 line camp switchboard

BD-14.jpg

40line camp board.jpg

References

  • TR 1225-5 Signal Corps. Telephone Switchboard, Type BD-14 (12 February 1930)
  • TM 11-331 Switchboard BD-14. War Dept. Jun. 1941. 16 p. U408.3.A13 TM 11-331 Jun. 1941