Last year someone gave me this old tube cutter. I'm sorry I don't remember who. It was used to cut old clay wall tubes to the desired length. Just recently I found the 1907 patent for the tube cutter. The tube cutter does not have any patent dates or manufacturer's markings. Apparenlty it was made after the patent expired in 1924. http://reference.insulators.info/patents/detail/?patent=U-870951