Granted Patent
Utility
US 4,883,270 · App. 07/308,192
Four-bar variable-resistance frontal calf developing machine
Inventor:
Henry Maag
Patented Case
View Patent ↗
Granted: Nov 28, 1989
Filed: Feb 9, 1989
Inventor
Henry Maag
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.