Indicator, two button
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LicenseIndicator, two button, Sax's patent
Science Museum Group
© The Board of Trustees of the Science Museum
Indicator, two button, Sax's patent, marked 'SAX'S PATENT NO 8844 June 1888'.
Details
- Category:
- Telecommunications
- Object Number:
- 1914-801
- type:
- indicator
- credit:
- General Post Office. Telecommunications
