Pipe line inspection device

Details Pipe line inspection device Pipe line inspection device

1994-12-23

1996-04-30

Zarfas, Louis S.

Photography and optical equipment

Optical article not elsewhere specified

D16134

Patent

active

D03693651

REFERENCES:
patent: D347440 (1994-05-01), Holznagel
patent: 1018771 (1912-02-01), Neuburger
patent: 1054253 (1913-02-01), Stuart
patent: 2479262 (1949-08-01), Richards
patent: 2794363 (1957-06-01), Parfitt
patent: 3228108 (1966-01-01), Chaperon
patent: 3981021 (1976-09-01), Beecher

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