Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 315
it opening is threaded, as well as the stem cover throughwhich the extension is made in the conduit to the desk or table. Whenthe floor outlet connection is not required, the stem cover may beremoved and a flat, blank cover be used to replace the same. A form of outlet-box used for flexible steel…
Architecture · Building · Carpentry
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