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Shaft encoder with integral 'Thalimedes' data logger, 1997

1997
Horizontal water-level recorder type X, with lead shot filled weight, and spare parts including cables, and recording charts, by OTT Messtechnik GMBH & Co. KG, Kempten, Bavaria, Germany 1997

Horizontal water level recorder, 1997

1997
Ott's universal planimeter, in fitted case.

Ott's universal planimeter