Spacer for electrical outlet and switch mounting boxes
作者： Walter E. Skowron , Carl S. Skowron
DOI:
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摘要:
lens.org 参考文章(3)
Akira Mizusawa, Plastic fastener for spacing and supporting two plates ,(1986)
Almy D Coggeshall, Harold R Shirk, Spacing means for electrical devices ,(1959)
Bell, W William, Structural spacer member ,(1963)