Dennis J. Helfritch

AI American Precision Industries: 1 patents #1 of 3Top 35%

📍 Rapid City, SD: #1 of 4 inventorsTop 25%

🗺 South Dakota: #4 of 34 inventorsTop 15%

Overall (1982): #69,589 of 81,411Top 90%

Patents 1982

Issued Patents 1982

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
4357151	Electrostatically augmented cartridge type dust collector and method	Edward J. Gonas	1982-11-02