Pipes and tubular conduits – With closures and plugs – Lateral opening
Patent
1978-01-16
1980-06-10
Martin, Jr., William D.
Pipes and tubular conduits
With closures and plugs
Lateral opening
49465, 160 96, 220259, F16L 5510
Patent
active
042067847
ABSTRACT:
An access door primarily designed to provide an insulated entrance to heating, ventilating and air conditoning ducts consisting of a two-pan structure lockably connected together by a simple unfastening means.
REFERENCES:
patent: 2000366 (1935-05-01), Victor
patent: 2167597 (1939-07-01), Webb
patent: 2209580 (1940-07-01), Sargent
patent: 2507885 (1950-05-01), Byrnes
patent: 3494651 (1970-02-01), Fork et al.
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