Ceiling panel and lens

作者: James Dodich

DOI:

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摘要: A ceiling panel having an elongated bottom face and opening with opposite parallel edges, two moldings respectively first portions engaging the edges second spaced outwardly away from above opening, a lens placed on between portions, being held in place by downwardly bent areas of while are at lens.

参考文章(5)
George R. Roland, Panel ceiling and light fixture ,(1980)
Giers Clarence A De, Fastening device for cover plates ,(1945)
Stuart T Martin, Marshall C Pease, High frequency window structure ,(1949)