Thread: A new box of tetnus

Nice article. I do imagine the first step was hollow grinding by hand and then this guy made a machine to make it more precise and mass producable. But, a machine like that could have made hollow grinding more common.

So, I was off by 20-50 years.

I think you'll find that that is very close to the window of speculation with razors most of the time. Somewhere between 10 to 30 years.
By the way, remember that website. He's a member of SRP although I haven't seen him active for a while. Anyway, he has a lot of good information on razors. If you have a question about one that's a good place to start.