Shade assembly for light sources of tubular shape
作者： Thomstad Magne Vilhelm , Wiig Arnold
DOI:
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摘要:
lens.org 参考文章(4)
John F. Fessel, Bracelet flashlight holder ,(1939)
John A Roberts, Shield for mercury vapor lamps ,(1942)
Kenneth F Smith, Arrangement for supporting a string of elongated tubular lamps on a supporting cable ,(1950)
George O French, Roy Jacques H Du, Light-diffusing shield for elongated tubular lamps ,(1948)