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son? RED BRASS BOEINGS (NO. 1 COMPOSITION BORINGS) shall consist of clean red brass borings and turnings; shall have a copper content of not less than 81$, a tin content of not less than 3§$, and a lead content of not more than 7$, shall be free of borings or turnings from aluminum bronze castings, manganese bronze castings or silicon bronze castings, grindings and all foreign material, but may contain a total of not more than 2$ combined free iron, oil and other moisture. UNLINED STANDARD RED CAR BOXES shall consist of railroad boxes or car journal bearings, shall be free of yellow boxes, iron-backed boxes and linings, and may contain a total of not more than 1$ combined dirt and grease, LINED STANDARD RED CAR BOXES shall consist of lined railroad boxes or lined car journal bearings, shall be free of yellow boxes, iron- backed boxes and may contain a total of not more than 1$ combined dirt and grease, COCKS AND FAUCETS shall consist of clean mixed red and yellow cocks and faucets and shall be free of gas cocks, die cast cocks and faucets, dirt and iron, RED BRASS BREAKAGE (IRONY COMPOSITION) shall consist of red brass castings, including carburetors, containing not in excess of 10$ free iron and shall be free of die cast, aluminum and iron carburetors and yellow brass, YELLOW BRASS CASTINGS shall consist of yellow brass castings, shall have a copper content of not less than 65$, and shall be free of aluminum bronze castings, silicon bronze castings, manganese bronze castings, brass forgings, dirt and iron.