Colorimeter

Details Colorimeter Colorimeter

1989-01-04

1991-07-16

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Chemical

Patent

active

D03182452

REFERENCES:
patent: D252801 (1979-09-01), Usuda
patent: D282644 (1986-02-01), Collister
patent: D292277 (1987-10-01), Collister et al.
patent: D309437 (1990-07-01), Ng
patent: D312621 (1990-12-01), Soren et al.
patent: 4552458 (1985-11-01), Lowne

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