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- Patent Model of Edison's Automatic Telegraph Transmitter and Receiver Improvement, 1875 -

- 1875
- Collections - Artifact
Patent Model of Edison's Automatic Telegraph Transmitter and Receiver Improvement, 1875
- Patent Model of Edison's Electrical Printing Machine, 1872 -

- 1872
- Collections - Artifact
Patent Model of Edison's Electrical Printing Machine, 1872