Oh, you bring up something interesting now. I think Deere, has a "Deere green" (not the song).
Maybe, but yellow & black is also standard colour combination for industrial safety.
DeWalt won't be able to stop a competitor from selling yellow and black safety tape because the color is essential to the functioning of the product. The color of a cordless power tool, however, is not essential to its function; the color could be red, orange, chartreuse, blue, and the tool would work just as well.
My dad has an ancient DeWalt radial arm saw, and it's green.
Stanley tools are also black and yellow.
Dewalt is one of Stanley Black and Decker's brands. But I don' think they offer many power tools under the Stanley brand (though now SBD is using Dewalt for hand tools like tape measures, etc.).