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For preventing the unauthorized firing of a hand held weapon (US 4467545 A)
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Programmable to provide for its firing only by an authorized user (US 5502915 A)
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Gun with electrically fired trigger (US 5625972 A)
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For preventing the unauthorized firing of a weapon (US 5946840 A)
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Personalized safety device for a hand held weapon (US 6253480 B1)
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