ISOMETRIC EXERCISER HAVING INITIALLY-OPERATIVE RESILIENT RESISTANCE
United States Patent 3498609
Inventors:
Lukens, David R.
Publication Date:
03/03/1970
Assignee:
David, Lukens R.
Other Classes:
73/379.080, 482/125
International Classes:
A63B21/055; A63B21/02; G01L5/06; A63B21/00; A63B21/02