• Country
• United States of America (USA)

• Manufacturer / Brand
• MILITARY U.S. (different makers for same model)

• Year
• 1935–1970 ??

• Category
• Morse-Equipment & TTY, RTTY, TDD etc.

• Radiomuseum.org ID
• 74420

• Wave bands
• - without

• Power type and voltage
• No Power needed

• Loudspeaker
• - - No sound reproduction output.

• Material
• Metal case

• from Radiomuseum.org
• Model: General Purpose Key J-37 - MILITARY U.S. different makers

• Shape
• Tablemodel, with any shape - general.

• Dimensions (WHD)
• 73 x 25 x 130 mm / 2.9 x 1 x 5.1 inch

• Notes
• General Purpose Key J-37 for the US-millitary services. This Phenolic oval based key was very widely used in many different applications. It was made by at least 5 manufactures and mounted on several different bases.
  Also for using with a knee-clip, then it is called J-45.

• Net weight (2.2 lb = 1 kg)
• 0.1 kg / 0 lb 3.5 oz (0.22 lb)

• Mentioned in
• Perera's "Telegraph Collectors Guide"

• Author
• Model page created by a member from D. See "Data change" for further contributors.

• Other Models

• Here you find 397 models, 349 with images and 210 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.
  All listed radios etc. from MILITARY U.S. (different makers for same model)