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<p>The <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Property_page/Filter">search filter</a> allows the inclusion of <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Query_expressions">query expressions</a> such as <code>~</code> or <code>!</code>. The selected <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Query_engine">query engine</a> might also support case insensitive matching or other short expressions like:</p><ul><li><code>in:</code> result should include the term, e.g. '<code>in:Foo</code>'</li></ul><ul><li><code>not:</code> result should to not include the term, e.g. '<code>not:Bar</code>'</li></ul>
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Patent-US-607397.pdf
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Fountain-pen
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Patent-US-607398.pdf
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Fountain pen
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Patent-US-607399.pdf
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Fountain-pen
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Patent-US-607400.pdf
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Fountain-pen
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Patent-US-607401.pdf
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Fountain-pen
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Patent-US-610428.pdf
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Fountain-pen
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Patent-US-61156.pdf
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Pen
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Patent-US-612013.pdf
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Fountain-pen
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Patent-US-614630.pdf
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Fountain-pen
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Patent-US-619701.pdf
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Fountain-pen
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Patent-US-619702.pdf
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Fountain-pen
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Patent-US-622256.pdf
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Fountain-pen
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Patent-US-625722.pdf
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Fountain-pen
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Patent-US-629519.pdf
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Fountain-pen
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Patent-US-630526.pdf
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Self-filling fountain-pen
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Patent-US-630527.pdf
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Self-filling fountain-pen
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Patent-US-631824.pdf
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Fountain-pen
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Patent-US-631909.pdf
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Fountain-pen
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Patent-US-632320.pdf
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Fountain-pen
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Patent-US-632633.pdf
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Fountain-pen
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