发明申请
US20110120836A1 CATERPILLAR TRACTION APPARATUS 有权
CATERPILLAR追踪装置

CATERPILLAR TRACTION APPARATUS
摘要:
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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