Whitfield Moretti designed the very drill that's the basis of the tool that started this thread; the design patent number is right on the nameplate. Design patents cover the appearance of a thing, rather than its function, while utility patents cover functional aspects (where the term "invent" applies more directly). Disclaimer: I may be overly sensitive to the difference between "design" and "invent" because I hold only utility patents myself.
Some of the pioneers in power drills held both design AND utility patents: Albertson, Desoutter, Black, Decker, and Wilhide all did, for example. Looks like we can add Mr. Moretti's name to the list!
The distinctive grooved grip is painted red on this drill, and looks factory. The cylindrical collar behind the chuck was clearly intended for attachments to clamp onto; on this example, it has been threaded. The extra feature on the trigger is pivoted on the pin whose end is visible in the main trigger part; it serves to latch the main part "On", and a second pull releases it. I'll bet that there's a patent on that latching mechanism, just as there is on the bottom-of-the-handle button that Glenn C. Wilhide invented for Black & Decker #2,283,778). I think that there was already one for the more common side-button latch, and that Wilhide was avoiding it. This idea would get around both types. There's another type where the entire trigger rocks to a latched position on some drills, and at least one where a wire bail hooks over the trigger (PET - Portable Electric tools - from Chicago used it).
BTW: in post #6 of this thread, I mentioned having over 130 drill BRANDS identified. I've been working on that aspect the last several days, and the count is now at 165! Some a foreign, but quite a few of the additions are American products. No doubt, many are merely rebadged versions of known manufacturer's products - but not all!
