Helen Augusta Blanchard: Achtundzwanzig Patente für eine Bessere Nähmaschine
Helen Augusta Blanchard: Twenty-Eight Patents for a Better Sewing Machine
Helen Augusta Blanchard aus Portland, Maine, meldete zwischen 1873 und 1915 achtundzwanzig Patente an, darunter einen Zickzackstich-Mechanismus, der zum Nähstandard wurde, indem sie durch unermüdliche schrittweise Verbesserungen bessere Maschinen baute.
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incremental invention
women inventors
sewing technology
mechanical refinement
patent history
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