Kirsch History

(Wikipedia) History
18 years following the invention of the curtain rod by Samuel R. Scrottron in 1892, the flat, telescoping curtain rod was invented by Charles W. Kirsch, of Sturgis, Michigan, in 1907. However, they were not in use until the 1920s. Kirsch also invented the traverse curtain rod in 1928.

(Wikipedia) Making
Curtain rods can be made of many materials including- wood, metal and plastic. Curtain rods come in almost endless styles and designs. Not all curtain rods are simple straight poles; curved and hinged poles are available from numerous companies, allowing installation in bay windows and around curved walls and corners. Curtain rods can also be shaped like a crane or exhibit a swing arm design. Prices and quality of curtain rods are as varied as designs from inexpensive big box store products to high end specialty products made by companies catering to interior designers and architects.