Wikipedia:Dettra Flag Company

The Dettra Flag company also known as Dettra Flags and Dettra Flag Products was a Flag Manufacturing Company founded by John Dettra in 1901-1902 in Oaks, Pennsylvania which produced Flags, Banners and Flagpole equipment until it's purchase by the competing Annin Flag Company in 1998.

History
The company was founded around 1902 by John Dettra which started off producing mostly flags, pennants, banners, "bannerettes", flag accessories, and other items with one of the earliest items made being a holder that attached flags to cars

In 1959, Dettra experienced a uptick in flag making after Alaska was admitted to the Union thus adding 49 stars to the U.S Flag but later when Hawaii was admitted the Company lost roughly $150,000 in canceled orders and unsalable inventory but later recovered due to roughly 2 million new flags being sold the same year.

Dettra's Products where tested to be durable and where sent to areas with Harsh Weather such as Florida and the South Western United States for testing. Depending on where the buyers lived later on John Dettra died in 1967.

John Dettra also sold other products besides flags such as sold hedge trimmers under the name Detco Manufacturing Company.