Binoculars; Diving helmets; Eyeglass cases; Eyeglass frames; Goggles for sports; Head guards for sports; Headphones; Knee-pads for workers; Life jackets; Life buoys; Photographic cameras; Pince-nez; Protective helmets; Protective helmets for sports; Spectacle cases; Spectacle frames; Sunglasses; Swimming goggles; Telescopes; Scuba diving masks

Inorganic and synthetic chemical additives used as an insulating packer fluid for oil and gas well operations

OIL SOLUBLE POLYMER ADDITIVES FOR USE IN DRILLING AND PACKER FLUIDS