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Bishop Harman photometer

1880-1920

Light meter TCC 182, in leather case

Photometer made by C.G. Delauriers, c. 1868

Photometer made by C.G. Delauriers, c. 1868

1868
Teco-meter extinction photometer, for veterinary diagnostic use, by Biochemica-Boerhinger, Mannheim, Germany, c.1975

Teco-meter extinction photometer

1970-1978