This is a rare, full-length 24-inch solid aluminum drafting machine scale manufactured by the Charles Bruning Company. Dating between 1948 and 1952, this model represents the era of heavy-duty, all-metal engineering tools before the industry shifted to plastic.

Key Features & Historical Details

Vard Inc. Mounting Hardware: Features the original aluminum "chuck plates" (mounting brackets) used to click the ruler into a mechanical drafting arm.

Patent Information: The mounting hardware is stamped with Patent No. 2,192,422, which was issued on March 5, 1940, to inventor Vard B. Wallace for this specific quick-release design.

Dual-Edge Profile: Includes one standard beveled edge for 1/16" measurements and one classic rounded edge for 1/32" "chain scale" increments.

Premium Material: Unlike later Lucite or plastic versions, this is the durable, professional-grade aluminum version sought after by collectors of mid-century industrial tools.

Condition: it is in great vintage condition with some scratching on the front of the ruler, there are places on the back that the patina has sworn off and a small red mark is on the end as you can see in the pictures.