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Signalling device
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Patent number 4,633,969
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Issue date Jan 6, 1987
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Malcolm G. Palmer
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F42 - AMMUNITION BLASTING
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3832949
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Patent number 3,832,949
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Issue date Sep 3, 1974
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F42 - AMMUNITION BLASTING
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3491687
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Patent number 3,491,687
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Issue date Jan 27, 1970
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F42 - AMMUNITION BLASTING
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3368641
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Patent number 3,368,641
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Issue date Feb 13, 1968
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F42 - AMMUNITION BLASTING
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3246286
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Patent number 3,246,286
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Issue date Apr 12, 1966
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G08 - SIGNALLING
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3233694
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Patent number 3,233,694
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Issue date Feb 8, 1966
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G08 - SIGNALLING
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2401955
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Patent number 2,401,955
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Issue date Jun 11, 1946
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G08 - SIGNALLING