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Spring element, especially for ball-joint tensioning devices with anti-tilting mechanism and tensioning mechanism
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Anti-inclining spring mechanism and tensioning installing mechanism for ball-and-socket type mounting device
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Tilt blocking mechanism and stressing fixing mechanism for ball-joint fixing devices
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Head assembly for supporting and adjusting the position of an optical or electronic device
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Structure for retaining and positioning optical or electronical appliance
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Spherical joint retainer especially for camera
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