Waits' Compendium Errata
A very useful resource is A Safety Razor Compendium by Robert K. Waits.
I have v1.2 and have found the following mistakes or inaccuracies.
I you find other problems in this great book, let me know and I'll add them here.
Introduction
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Page vi The term “safety razor” was not coined by the Kampfe brothers. See my research here.
Razors by brand
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Brandt Patent number is 807172, not 802172 -
Coronia Patent number is 775379, not 775397 -
Firm Blade “Uses one-half of a split Gillette-type double-edge blade” No, it doesn't. Won't fit. -
Gravin Heat Shaver Patent is US2324148 Moses M. Gravin - 13 July 1943 -
Krisp 26355 is patent GB190826355 2168 is patent GB190902168 “Circa 1919” is ten years later than the patents -
Rally Roller Shaver Inventor name is: Jonas Åke Gregorius Malmberg German patent: DE830305 US Patent: US2637902 Also, there is no such place as “Esjukstuna” in Sweden, but razors were manufactured in “Eskilstuna” (e.g. Heljestrand). -
SENCA Patent is by Philip (not Peter) H. Unsinger -
Supramat 378772 is 378722 and refers to Swiss patent CH378722 -
Wanie Rollband Blades The patent number should be 608066