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- Hartmann & Braun Compass, circa 1894 -
- circa 1894
- Collections - Artifact
Hartmann & Braun Compass, circa 1894
- Hartmann & Braun Meter, 1890-1893 -
- 1890-1893
- Collections - Artifact
Hartmann & Braun Meter, 1890-1893
- Hartmann & Braun Wattmeter, 1905-1920 -
- 1905-1920
- Collections - Artifact
Hartmann & Braun Wattmeter, 1905-1920