But here it is just the company making it. Like you find GM logo in Opel and Vauxhall brochures but it is not used in the name of the car.

The F-12 you're showing us does include International Harvester in the name. I've never seen Farmalls as being separate in any way from International Harvester, unlike Deering, Milawaukee, Morton, Hough, or other brands that they bought during much of the 20th Century. Anytime I've seen a tractor with the word "Farmall" across the hood, my first thought was this was an International Harvester-Farmall, espescially when the "IH" logo is right there for all to see.

Not too quick!

'Farmall' started as a model name, but evolved into a brand name.
http://en.wikipedia.org/wiki/Farmall

The IHC names are always troublesome. We have the corporation, a number of companies, many brand names, and lots of models, sometimes similar or almost similar models sold under a different company and/or brand name.

To what I know they should either be listed with 'Farmall' as the brand name, or, depending on the year, 'McCormick-Deering' / 'McCormick' / 'McCormick International' as the brand name and 'Farmall' as part of the model name.

IHC was always the company, not the brand.

I will try to find better information, but this seems not to be so easy.

I should do some renaming then...

No, I'd say it was just a more prominent model series. FYI, the Cub, and the Cub Cadet were originally part of that series.

Wasn't it considered as a separate make?

I don't know if anybody here is aware of this, but all the Farmall tractors that you've got listed, are built by International Harvester:


http://www.imcdb.org/vehicles_make-Farmall.html


http://en.wikipedia.org/wiki/Farmall_tractor

This is just a fact that I thought I'd let you know about, since you have it separate from I.H.C.