Elevated light system

作者: Rufus P. Steadman

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摘要: An assembly for supporting a light or other signal fixture in elevated position on standard, such as tower pole structure street and highway lighting, lowering the along standard to lower accessible service personnel repair, replacement servicing of fixture; including carriage with support actuating connection location generally following contour configuration at which location, may manipulate raising fixture.

参考文章(1)
Wayne W. Compton, Richard B. Shaner, Tenon for mounting a lighting fixture ,(1976)