Dust-control room

Building units and construction elements – Structure

Patent

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Details

D25 33, D2503

Patent

active

D02653478

REFERENCES:
patent: D241333 (1976-09-01), Wheeler
patent: 3623285 (1971-11-01), Kelly
patent: 4171596 (1979-10-01), Varlonga
Sweet's Architectural Catalog File, 1978, Section 13.13/AM, p. 3, bottom left illustration.

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