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US08663528B2 Caterpillar traction apparatus 有权
卡特彼勒牵引装置

Caterpillar traction apparatus
Abstract:
A caterpillar traction apparatus (110), wherein two pairs of pulleys (122 & 123, 132 & 133) can be driven at different speeds, so that the linear member (40) being driven by the mechanism is subjected to either compression or extension forces.
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