Fritz Kahn, The Life of Man / Das Leben des Menschen,1929. Franck`sche Verlagshandlung, Stuttgart. U
Fritz Kahn, The Life of Man / Das Leben des Menschen,1929. Franck`sche Verlagshandlung, Stuttgart. University of Pittsburgh Library. Via constellationsThe illustration depicts five parts of correspondence between a muscle movement and a doorbell wire. Illustrated by G. Edelstein. -- source link
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