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1652332
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Patent number 1,652,332
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Issue date Dec 13, 1927
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B22 - CASTING POWDER METALLURGY
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1552582
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Patent number 1,552,582
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Issue date Sep 8, 1925
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B22 - CASTING POWDER METALLURGY
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1529950
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Patent number 1,529,950
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Issue date Mar 17, 1925
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B22 - CASTING POWDER METALLURGY
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1450871
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Patent number 1,450,871
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Issue date Apr 3, 1923
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B22 - CASTING POWDER METALLURGY
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1338162
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Patent number 1,338,162
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Issue date Apr 27, 1920
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B22 - CASTING POWDER METALLURGY