Welcome,
Even today the word Carborundum is tossed around in circles of conversation with regard to sharpening stones and industrial abrasives. There was a good chance that your father and your grandfather had items around the home that were made by this company. Follow the link below and enjoy an article written by Straight Razor Place member Martin103 on the history of the Carborundum Company.
http://straightrazorpalace.com/hones...ce-1891-a.html
Enjoy the journey,,,,,