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API STD 1 12th Edition, March 1, 1957
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Additional Comments: W/D NO S/S
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1. This standard covers belting for oil-counter use of the following types: standard and premium quality V-belts, dimensional and marking requirements on V-belt sheaves; seven classifications of flat belts including requirements on tensile strength, elongation, general construction, testing and marking. Also included are recommended practices for power application of V-belts and rating of flat-belt drives for beam pumping of individual wells, and recommendations on care and use of V-belts and flat belts.

2. Nothing contained in this specification is to be construed as granting any right, by implication or otherwise, for manufacture, sale, or U88 in connection with any method, apparatus or product covered by letters patent, nor as insuring anyone against liability for infringement of letters patent.