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- Evershed & Vignoles Bridge Megger Resistance Box, circa 1914 -
- circa 1914
- Collections - Artifact
Evershed & Vignoles Bridge Megger Resistance Box, circa 1914
- Ayrton & Perry Ohmmeter, 1890-1899 -
- 1890-1899
- Collections - Artifact
Ayrton & Perry Ohmmeter, 1890-1899