The device includes a main body, a viewing window, and a link gear.
一种具有收纳式观景窗机构的装置、收纳式观景窗机构及其使用方法。
The support uses the four link motion gear, improves the support stress condition.
支架采用正四连杆机构，以改善支架受力状况。
The support uses the four link motion gear, improves the support stress condition.
支架采用正四连杆机构，以改善支架受力状况。
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