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Telescopic device for measuring distance between ball and target ball in game of boules
Telescopic device for measuring distance between ball and target ball in game of boules
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机译:用于测量球团比赛中球与目标球之间距离的伸缩装置
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摘要
The telescopic device has a throat tube (1) hinged from the main device to act similar to a compass for the determination of small distances. It is maintained in position against the return pressure of a spring by a brake button.
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