Waits' Compendium Errata and Addendum
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.
Page vi The term “safety razor” was not coined by the Kampfe brothers. See my research here.
Razors by brand
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.
Fonta “Wrexham, Wales, England” — Wales is not part of England. There are several patents:
GB597918 ― 1948-02-05
GB640185 ― 1950-07-12
CH279397 ― 1951-11-30
CH279398 ― 1951-11-30
GB672947 ― 1952-05-28
GB672948 ― 1952-05-28
GB690828 ― 1953-04-29
Gravin Heat Shaver Patent is US2324148 Moses M. Gravin - 13 July 1943
Hohlraum Rasier-Gerät The name is Hohlraum with an h in the middle.
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).
Schrägschnitt Hohlraum-Rasier-Gerät The name is Hohlraum with an h in the middle..
Also, the location is Bollwerk, not Boliwerk.
SENCA Patent is by Philip (not Peter) H. Unsinger
Supramat 378772 is 378722 and refers to Swiss patent CH378722
Ucan The patent is US1332587
Wanie Rollband Blades The patent number should be 608066
A.S.R., Ever-Ready, Star
1933-34 The last U.S. ‘Ever-Ready’ razor? Razor marked GEM. The box is correct, but the razor is wrong.
That's why it is marked GEM.
Here are images of the correct razor: