Cyclopedia of architecture, carpentry, and building : a general reference work ... (1907)
American School of Correspondence · Chicago : American Technical Society · leaf 249
Fig. 5. Outlet Box for Flexible Steel Conduit. strips are fed and formed over the same. In the process of manufac-ture, the spools of steel ribbon are of irregular length, and when a … ^Si
Architecture · Building · Carpentry
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