Addressograph Multigraph

Reducing this brand to an "A" for the sake of brevity. That company name is a mouthful!

A + impossible/Penrose triangle = Addressograph Multigraph

(I've always wanted to do one of these...)

A bit about Addressograph Multigraph:
(from Wikipedia)

The original company which manufactured the Addressograph, Addressograph International, merged in 1932 with American Multigraph of Cleveland, Ohio, to form the Addressograph-Multigraph Corporation manufacturing highly efficient addressograph and duplicating machines. In 1978 the corporate headquarters moved from Cleveland to Los Angeles, California, and the corporation name changed in 1979 to AM International. In 1982, the firm filed for bankruptcy under Chapter 11.[3]