Inventor
EHLING JOHN T
US3 patents
Patents
3 patentsUS11213878B2Jan 4, 2022
Apparatus and method for forming duct flanges and duct work
HVAC INVENTORS/SYSTEMATION INC2 citations67
US11697147B2Jul 11, 2023
Apparatus and method for forming duct flanges and duct work
HVAC INVENTORS/SYSTEMATION INC0 citations56
US12257618B1Mar 25, 2025
Apparatus and method for closing duct seams and for inserting angle plates and closing duct seams
HVAC INVENTORS/SYSTEMATION INC0 citations46