In plate, lower left: RCR / XXXVII
Watermark: BFK
Etching printed in black on wove paper
Gift of Dr. Siegfried F. Aram
47.14
In plate, lower left: RCR / XXXVII
Watermark: BFK
Rudolf von Ripper, The Machine Was Invented to Serve Man, 1937, Etching printed in black on wove paper. Detroit Institute of Arts, Gift of Dr. Siegfried F. Aram, 47.14.