Generac Power Systems

Customer-service line：+1‑855‑GEN‑INFO

Here is the English translation:
It has multiple manufacturing facilities in Wisconsin (Waukesha, Berlin, Oshkosh, Jefferson, Eagle, and Whitewater), where G-FORCE and OHVI engines are designed and manufactured.
The company was listed on the New York Stock Exchange (NYSE: GNRC) in 2010 and is now a component of the S&P 500 index.
It was founded in 1959 by Robert Kern.

Company Name：Generac Power Systems

Company Address：Waukesha, Wisconsin, USA

Established Year：1959

Brand website：https://www.generac.com