Patent Working Drawings. By H ... and costly working models have to be resorted to in order to avoid the mystification which ordinary mechanical drawings often produce in the minds of ...

Mechanical drawing, labeled "119" used in the development of the bowling pin setting machine developed by the donor's grandfather, Fred Schmidt. In the late 1930s, Schmidt patented "a method for ...

Mechanical drawing, labeled "111" used in the development of the bowling pin setting machine developed by the donor's grandfather, Fred Schmidt. In the late 1930s, Schmidt patented "a method for ...