Got this addle corer and the fodder clamp at auction this AM. Corer is well marked with Boye Needle co as maker and Nov 28 1918 as patent date. only problem is N0v 28 is not a patent issus date. Handle has that old well used feel and the cross drilled hole is user addition. The fodder clamp was part of the lot. Welcome all guesses on correct patent date.
