Jisho

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Noun
1. gripper; hand-gripper
Wikipedia definition
2. GrippersGrippers, sometimes called hand grippers, are primarily used for testing and increasing the strength of the hands; this specific form of grip strength has been called crushing grip, which has been defined as meaning the prime movers are the four fingers, rather than the thumb. There are differences from brand to brand, but the common features of standard grippers are that they use a torsion spring fitted with two handles.
Read “Grippers” on English Wikipedia
Read “ハンドグリッパー” on Japanese Wikipedia
Read “Grippers” on DBpedia
Other forms
ハンド・グリッパー

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