Drilldown: Patents
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Patents > Year filed:
1910 - 1919
& Office :
AU or
DE or
DK or
SE or
UN
& Publication date:
August 6, 1918
& National tech categories :
DE 77h.15 or
FR 6.4
& Family year:
1913
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Showing below up to 1 result in range #1 to #1.