UNITED STATES PATENTS
Single Pivot R.G.O. (Pat.#: 4,964,628) Dual Pivot R.G.O. (Pat.#: 5,320,590)
These patents were granted to Christopher Poplawski, in October of 1990 and June of 1994.
Single Pivot R.G.O. (Pat.#: 4,964,628) Dual
Pivot R.G.O. (Pat.#: 5,320,590)
