Top IPC subclasses
1
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F04D
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1
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non-positive-displacement pumps
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2
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F16B
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1
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devices for fastening or securing constructional elements or machine parts together, e.g. nails, bol
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3
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F16L
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1
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Pipes; joints or fittings for pipes; supports for pipes, cables or protective tubing; means for thermal insulation in general
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