Mechanical Contracting & Plumbing January-December 1912 . The Question Box Subscribers are Urged to Send Questionsto be Answered, or to Comment on Let-ters Published. Descriptions of JobsDone or Shop Kinks are Also SHOWING DIFFERENCE IN CORN-ER VALVES. Editor, Plumber and Steamfitter.—I can not readily tell which is the rightand which is the left of the cornervalves. Will you please be kind enoughto show the same in the next issue of the

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplumbin, bookyear1912