O-ring test method and apparatus for measuring muscular strength

O.sub.2 level responsive system for and method of treating a mal

Object dislodging method and apparatus

Objective determination of the rate of oxygen utilization in per

Objective optical system for endoscopes

Objective part replaceable endoscope tip

Obstetric device and method

Obstetric device for assisting in the birth of animals

Obstetric gloves

Obstetric suction device

Obstetric tractive device

Obstetric vacuum extractor and method of using the same

Obstetrical instrument for rupturing the amniotic membranes

Obstetrical tool for animals

Occipital support for cervical traction

Occlusal instrument

Occlusal lip and cheek retractor

Occlusal splints and the method of manufacturing the same

Occlusion clip and instrument for applying same

Occlusion device