Acid-resistant copolymer and photographic element incorporating

Activation of silver halide photographic developers

Active field polarized media air cleaner

Acylacetanilide coupler with heterocyclic diacyl amino coupling-

Additive for inhibitor removing bath

Adhesion of hydrophilic layers on polyester film

Adjustable air filter

Adjustable air filtering device

Adjustable eddy electrostatic precipitator

Aerodynamic-electrostatic particulate collection system

Aerodynamic-electrostatic particulate collection system

Aerosol collector and concentrator

Air cleaner

Air cleaner

Air cleaner

Air cleaner

Air cleaner and its ionizing unit

Air cleaner and shut-down method

Air cleaner conductor system

Air cleaner electrostatic precipitator cell