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Tianjin Ruister International Co., Ltd: Find professional leather, mining, food additive, fertilizer, water treatment manufacturers and suppliers in China here. Our factory offers high quality sodium
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Bell-crank linkage. A bell-crank linkage changes the direction of movement through 90°. A bell-crank linkage tends to look a little like an "L" or, as shown in the diagram below, a mirror image of an "L".