Helen Augusta Blanchard: Ventotto Brevetti per una Macchina da Cucire Migliore
Helen Augusta Blanchard: Twenty-Eight Patents for a Better Sewing Machine
Helen Augusta Blanchard di Portland, nel Maine, depositò ventotto brevetti tra il 1873 e il 1915, tra cui un meccanismo di punto zigzag diventato uno standard della cucitura, migliorando le macchine attraverso un perfezionamento incrementale costante anziché con una singola grande invenzione.
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Helen Augusta Blanchard: Twenty-Eight Patents for a Better Sewing Machine
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