Regeneration of photographic processing solutions
Removable antiblocking top coat
Removable filter for a forced air duct grill
Removal device for electrostatic precipitators
Resist process
Respiratory air filter
Restraining layer for retarding the diffusion of hydroxyl ions i
Reversal color photographic process
Reversal imaging process including redox amplification
Reversal imaging process including redox amplification
Reversal processing of exposed Lippman-emulsions
Reverse-printing method for producing cathode-ray-tube-screen st
Roll fastening for roll films
Ruthenium containing photographic developers