About all I have on Louisville drills is an ad from the August, 1922, issue of Machinery magazine. I think you'll find it interesting, though. I can't see a trigger switch in the ad, but yours has one. Black & Decker patented that feature around 1917, IIRC; Louisville must have been paying a royalty or been otherwise connected with B&D. Yours must be later than 1922, because it has what I see as an improved lower handle, with that switch.