The Isolator Helmet is from 1925: https://www.thevintagenews.com/2015/12/22/the-isolator-an-invention-from-1925-designed-to-improve-work-productivity/ https://

The Isolator Helmet is from 1925: https://www.thevintagenews.com/2015/12/22/the-isolator-an-invention-from-1925-designed-to-improve-work-productivity/ https://www.thevintagenews.com/2015/12/22/the-isolator-an-in...