Visual marker

Details Visual marker Visual marker

1981-02-23

1984-03-20

Kemper, Catherine E.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Visual

D20 10

Patent

active

D02730952

REFERENCES:
patent: D235745 (1975-07-01), England
patent: 1880130 (1932-09-01), Goldbach
patent: 3485202 (1969-12-01), Platt

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