Or to give the original title for the Austrian patent granted in 1911; “Sicherheitsvorrichtung für Rasiermesser”. A more direct translation would be “Safety contraption for shaving knife”.
The original approach – as exemplified by the 1762 Perrett’s safety razor – was to place a guard on a straight razor. The idea were only slightly changed in the guise of Paul Zammet’s Improved Razor Guard. And in 1911 Thomas Claude Durham made another incremental improvement. Well, that and a bit more.
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