Described by the makers, "Boley & Leinen" of Esslingen in Germany as "A precise 'straight drilling' device, the Type D.R.G.M. 'Leinen' No. 1741 of an improved construction with a height-adjustable spindle carrier, two hardened pointers for the precise marking of the spot to drill, two collets to hold drill bits, and two "American style" adjustable clamps to fit into the two radial slots on the round table. Complete in a fitted wooden box Part Number 34.55".  Might the advertisement refer to an earlier model - shown lower down the page - where the head could be swivelled around the column but not adjusted vertically. Perhaps both were offered at the same time, their functionality being sufficiently different to accommodate a range of different tasks.
Although the illustration in the two advertisement (perhaps from the early 1900s?) gives no hint as to the quality of the machine, the surviving two examples shown below are of the most elegant design and execution - and resplendent in their nickel-plated finish.
A later Leinen (Boley & Leinen) machine that used a similar design was the precision bench miller, a unit that was to copied and further developed in England and sold as the  Sigma Jones, Ultra, Excel and B.C.A.