Optimized ball bat

Optional group selection play for a lottery

Optional jackpot prize lottery system

Oral appliance

Oral appliance suitable for use as sports guard

Oral care gaming system and methods

Orbit ball

Orbital hockey game

Orbital resistance-adjustable sphere exercising apparatus

Organic peroxide paste

Orientation aid for use when swimming on the back

Orientation marker for golf club having releasable and...

Ornamental figure construction kit

Ornamental game with underwater moving mechanism

Orthopaedic pedal

Orthopedic exerciser

Orthopedic exerciser

Orthopedic exerciser

Orthopedic exercisor

Oscillating ball throwing machine