R99 (English, noun)
expansion: R99 (countable and uncountable, plural R99s)
Senses:
glosses: R99; Ellipsis of NIOSH R99.
R99 standard
tags: uncountable
glosses: R99; Ellipsis of NIOSH R99.
R99 filter
tags: countable
Forms:
form: R99s
tags: plural