- date(s):
- 1937-1960
- creator(s):
- Instructograph Company; AMECO; Western Electric; American Telephone and Telegraph Company
- subject(s):
- Civil defense; Cold War
- place(s):
- New York City; North America; Illinois; Cook County, Chicago; North America; New York; New York City
- type(s):
- Device, Morse Code Instruction
