Pattern Company History
Here are links to the stories behind some of the better known Pattern Companies.
Some dates below are from CoPA

Advance - 1932-196
Burda - 1952 - present
Butterick -1863-present
Folkwear - Mid 70's - present
Hollywood - 1932-1947
Kwik Sew - 1967- present
McCalls -1870-present
Simplicity - 1927-present
Vogue - 1899-present
(if you have more information about these or other Sewing Pattern Companies please Contact Me)