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NATIONAL SILVER COMPANY - New York
All plates are marked made by Crown Chelsea China Company and marked with Crown Chelsea China Company's stamp
After bing affixed to a product many were distroyed during the process of opening then using the product which then destroys (cancels) the stamp
as well as standard steel pipe
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Six Inch (6") Standard STD- Storm Collar Choose Collar:703029 Five Inch 5.0" (5.563" hole) Six-inch size STD -Storm Collar NATIONAL SILVER COMPANY - NewThe patented Large 6" STD Storm Collars (#5067291) weatherproof single, or closely grouped, pipe penetrations. These storm collar designs attach to the structure of the penetration to create a water tight umbrella counter flashing cover over a roof Jack Flashing. STD Storm collars are "Slide on from the top" storm collar designs. By utilizing a storm collar counter flashing method, that slides onto a penetrating structure, a speedy to install goop
