While browsing for info on a Ben Hur razor on ebay I came across this page. It contains a history of German manufacturers of razor and pocket knives. I though some folks might find it useful but I didn't know where to post it as they obviously would have made straight razors as well.
http://www.archivingindustry.com/cutlers&toolmakers/razormakers.htm
http://www.archivingindustry.com/cutlers&toolmakers/razormakers.htm