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Open wrench
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Patent number 9,120,210
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Issue date Sep 1, 2015
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Tsan-Chang Lee
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Ratchet wrench
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Patent number 9,016,174
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Issue date Apr 28, 2015
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Tsan-Chang Lee
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Complex wrench
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Patent number 8,701,524
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Issue date Apr 22, 2014
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Chiou-Mai Chang
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Ratchet wrench
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Patent number 8,661,946
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Issue date Mar 4, 2014
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Tsan-Chang Lee
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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One-direction rachet wrench
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Patent number 8,261,635
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Issue date Sep 11, 2012
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Tsan-Chang Lee
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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Wrench with outstanding grip
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Patent number 7,387,052
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Issue date Jun 17, 2008
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Chiou-Mai Chang
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B25 - HAND TOOLS PORTABLE POWER-DRIVEN TOOLS MANIPULATORS
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