Letter scale

Details Letter scale Letter scale

1977-01-31

1979-01-30

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Weight, force or density

D10 90, D1004

Patent

active

D02509350

REFERENCES:
patent: 440959 (1890-11-01), O'Marra
patent: 549534 (1895-11-01), Riess
patent: 2335693 (1943-11-01), Osterberg
patent: 2949287 (1960-08-01), Linsley
patent: 3830322 (1974-08-01), Mills

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