Moreover, I am well aware of the meaning of the origins of the word respirator and I daresay my guess wasn't entirely uninformed: respirators are typically breathing devices meant to keep out dust, and I'm sure you're aware (see what I did there? I'm not actually sure!) that in the early days of wrist watches, dust-proofing a case was as important a challenge as water-proofing it. One might even argue that in some cases 'water-proof' was - at least partially - a marketing term for the watches' equally relevant but less 'sexy' dust-proof qualities.
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