Margaret Knight was an employee in a paper bag factory when she invented a new machine part that would automatically fold and glue paper bags to create square bottoms for paper bags. Paper bags had been more like envelopes before. Workmen reportedly refused her advice when first installing the equipment because they mistakenly thought, "what does a woman know about machines?" Margaret Knight can be considered the mother of the grocery bag, she founded the Eastern Paper Bag Company in 1870.

 

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