BD-70-T1

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Related files

Adobe_PDF_icon.png BD-70-T1 Preliminary Instructions[1]
Description and Operating Instructions
Switchboards
BD-70-T1 (Flash Ringing)
14 June 1933


References

  1. BD-70-T1 Preliminary Instructions,
    "US Army Technical Manual Collection,"
    from the CECOM Historical Office archive, Aberdeen Proving Ground, MD.
    CECOM Historical Office