Frame member for constructing a duct

Details Frame member for constructing a duct Frame member for constructing a duct

1990-06-22

1993-09-21

Word, A. Hugo

Building units and construction elements

Architectural stock material

Extruded shape

Patent

active

D03396410

REFERENCES:
patent: 1919716 (1933-07-01), Freeman
patent: 2576296 (1951-11-01), Green
patent: 2667241 (1954-01-01), Shannon
patent: 3286405 (1966-11-01), Schembri
patent: 3854248 (1974-12-01), Dayus
patent: 4028856 (1977-06-01), Dalbec
patent: 4553363 (1985-11-01), Weinar
patent: 4598516 (1986-07-01), Groshong

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