cylinder, oxygen mask

shark repellent, wetsuit, sharkskin, repeller, finless, stonefish, sandworm, bonzer, aspirator, doohickey, oilskin, wiggler, gilet, aquanaut, cossie, eggbeater, bathyscaphe, bathyscaph, lilo, unguent, horsehead, lemon squeezer, overshoe, zoetrope, bilge pump, lanternfish, gulper, alembic, whatsit, ballcock, scuba, aether, plimsoll, frogman, lauhala, bathysphere, snorkel, contraption, capstan, narcosis, antifouling, windlass, piton, adolphe sax, nitrogen narcosis, thingamabob, wind vane, invention, phlogiston, ragworm, nudibranch, clodhoppers, onanism, photographic emulsion, monokini, skat, davit, wine cask, dickie, ouija board, absorbant, mermen, duckie, phonautograph, ascender, hydrofoils, chamois cloth, gabardine, tachyon, remora, muttonchops, surfboarding, chiton, eskimo, mustachio, dyna, frug, submersible, snuffer, glub, caul, lubber, nouvelle vague, mentalism, hang glider, brownian, squeezebox, jet propulsion, duffel coat, rubberlike, merkin, obscura, blowhole, nouveau roman, trireme, skidoo, vacuum flask, skeg, paramecia, epigram, wader, dreadnaught

breathing apparatus, breathing device