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- Wheatstone Mono Recorder, 1850-1870 -
- 1850-1870
- Collections - Artifact
Wheatstone Mono Recorder, 1850-1870
- Homemade Telegraph System, 1940-1960 -
- 1940-1960
- Collections - Artifact
Homemade Telegraph System, 1940-1960
- Telegraph Recording Receiver, Used by the Chicago Fire Department, circa 1890 -
- circa 1890
- Collections - Artifact
Telegraph Recording Receiver, Used by the Chicago Fire Department, circa 1890