F - Mech Eng,Light,Heat,Weapons – 24 – F
Patent
F - Mech Eng,Light,Heat,Weapons
24
F
189/16
F24F 13/02 (2006.01) F16L 45/00 (2006.01)
Patent
CA 1259042
Abstract ACCESS DOOR An access door for an air conditioning duct or the like has a circular frame intended to be rotated into a circular opening in the duct wall. The frame has an inwardly extending circular shoulder against which abuts a removable circular door held in place by latch means engaging within a circular groove formed in the frame.
525573
Fortenberry Kirby C.
Keating Henry M.
Flexmaster U.s.a. Inc.
Macrae & Co.
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