During World War II the Pfiffner Machine Co. manufactured a radial drill press that was based on the Atlas Press Co. Model 63 drill press: an additional casting and jack-shaft were added between post and head that provided a hinged connection to the head and increased the machine's reach. The "Pfiffner" name is cast into the pulley guard over the spindle.

Information Sources

• 1945 US Department of Commerce Master Disks, listing of "Pfiffner Machine Co., St. Louis, Mo." among "acceptors" of a government standard for the use of "Master Disks", which were a set of disks of precise dimensions, used for calibration and measurement.
• 1947 Directory of Metalworking Machinery, lists "Pfiffner Machine Company, 6417 Michigan Ave., St. Louis, Mo." One product is listed: "Radial Drill, Elbow Pointed Arm, Floor Type, Sensitive / (manufacturer's model) Drillmaster / (size or capacity) 36-inch swing, 4-inch dia. column / (standard commodity code) 3413 44 10 52 / (manufacturer and model code) 7072 01".
• 1949 issue of American Machinist (Volume 93, Issues 9-13, page 265), used-machinery ad listing a "20-inch Pfiffner Drillmaster, 1942". That date of manufacture lines up with the Atlas Press model 63, which was introduced in 1939 and remained in production until about 1948.
• December 1952 Directory of Metalworking Machinery (1951 Revision): First Addendum lists Pfiffner Machine Co. as a maker of Sensitive Floor Type Drilling Machines.