[AT] MM UDLX and Yakima Hitch

[James Peck]

page 88 shows a Caterpillar D2 with Killifer power lift tool bar for field work.

I have a copy of the picture book "TRACTOR THE DEFINITIVE VISUAL HISTORY".  
https://www.worldcat.org/title/tractor-the-definitive-visual-history/oclc/891617714

[James Peck] On some fifties era Caterpillar D2 and D4s, the lower links of the toolbars were outside the tracks. The tool bar and the cylinder to raise it do bear some resemblance to three point hitch.

https://goo.gl/images/3QZVf7