gasmask, respirator, gas helmet
['apron', 'lens cap, lens cover', 'ashcan, trash can, garbage can, wastebin, ash bin, ash-bin, ashbin, dustbin, trash barrel, trash bin', 'microphone, mike', 'greenhouse, nursery, glasshouse', 'oscilloscope, scope, cathode-ray oscilloscope, CRO', 'radio, wireless']