The broken lines in the drawings represent unclaimed environmental subject matter.
The broken lines in the drawings represent unclaimed environmental subject matter.
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1886866 | Blakesley | Nov 1932 | A |
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3852025 | Placek | Dec 1974 | A |
4793321 | Rafford et al. | Dec 1988 | A |
4846671 | Kwiatek | Jul 1989 | A |
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5287832 | Uhl | Feb 1994 | A |
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20060292510 | Krauklis | Dec 2006 | A1 |
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Number | Date | Country |
---|---|---|
4219443 | Dec 1993 | DE |
2354499 | Mar 2001 | GB |
2000237566 | Sep 2000 | JP |
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03062705 | Jul 2003 | WO |