Froglegs

I am going through my late dad's toolshed and finding all sorts of things. Attached are pictures of what I believe is an accessory. Looks like something that came a a multi purpose tool. The only maarkings on it are L-XT and tghe numbers 11-31. Sad but necessary job. My brothers declared it all junk and wanted to call a haul-away. Salvaged Craftsman band saw, bench top drill press, and a joiner planer so far which are all cleaned up and working. Gave them to the grandkids who, when younger, said after breakage or malfunction of anything was "papaw can fix it". Thanks in advance for any help!