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Keyless lock
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Patent number 4,799,371
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Issue date Jan 24, 1989
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Aardee Spring & Lock Co., Ltd.
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Robert Duncan
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
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Keyless lockable security devices
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Patent number 4,280,726
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Issue date Jul 28, 1981
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Aardee Spring & Lock Company Limited
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John McCoag
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G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
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Padlock
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Patent number 3,937,507
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Issue date Feb 10, 1976
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Aardee Spring & Lock Company Limited
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John McCoag
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E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES