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Ice penetrating moored mine
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Patent number 4,966,079
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Issue date Oct 30, 1990
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The United States of America as represented by the Secretary of the Navy
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Samuel A. Humphrey
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F42 - AMMUNITION BLASTING
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3811379
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Patent number 3,811,379
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Issue date May 21, 1974
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F42 - AMMUNITION BLASTING
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3017831
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Patent number 3,017,831
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Issue date Jan 23, 1962
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F42 - AMMUNITION BLASTING
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2942545
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Patent number 2,942,545
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Issue date Jun 28, 1960
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F42 - AMMUNITION BLASTING
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2848945
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Patent number 2,848,945
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Issue date Aug 26, 1958
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F42 - AMMUNITION BLASTING
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2616369
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Patent number 2,616,369
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Issue date Nov 4, 1952
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F42 - AMMUNITION BLASTING
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2493788
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Patent number 2,493,788
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Issue date Jan 10, 1950
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F42 - AMMUNITION BLASTING
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2472866
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Patent number 2,472,866
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Issue date Jun 14, 1949
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F42 - AMMUNITION BLASTING
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2398794
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Patent number 2,398,794
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Issue date Apr 23, 1946
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F42 - AMMUNITION BLASTING
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1442345
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Patent number 1,442,345
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Issue date Jan 16, 1923
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F42 - AMMUNITION BLASTING