Worcester, MassachusettsWorcester, Massachusetts, a birthplace of the American Revolution, is a city of many industrial firsts, including Eli Whitney's cotton gin, Elias Howe's sewing machine, Dr. Russell L. Hawes' machine for folding plain paper into envelopes, and Ester Howland's mass produced Valentines. Other Worcester firsts include American postcards, new loom designs, the corset, the all night lunch, the first national convention advocating women's rights, the