air-gap barrier

augmentings blennorrheal conjunctivitis blue-purplest boutcher cobalt minerals ControlPak finder light fogies frictional prop geoprivacy hanoverian lines inter-service support lithoglyphs metallic-nonmetallic O-ring seal multiple impairments narrow-pillar file oil-extended natural rubber process lapse rate ptychomitrium(mitt.)jaeg. silent chain sprocket hob