In 1932 Mr Robert John filed a patent for a double blade safety razor. That is, he patented a razor that used two blades. Although, in hindsight, what he really patented was a unique blade design.
Doubling up the blade edges is a recurring idea. We looked at a few before, like Janos Oscar Plesch’s double double edged blade, Staats-Oels’ two blade double edged slant, a double double edged cartridge razor, and most recently Gillette’s disposable blade unit. So John wasn’t breaking new ground, although the way he wasn’t was novel.
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