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US4800970A Flexible beam mechanical weighing scale 失效
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Flexible beam mechanical weighing scale
摘要:
A small mechanical weighing scale capable of weighing relatively light, flat articles such as envelopes. The scale contains a slidable pullout flexible beam that is adapted to hold a thin flat article. The tape will break away in accordance with the weight of a held article as the tape is extended from the housing of the scale.
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