Rezeptblatt
Pages
1
Rhythm calculator
Patent 2513196
Authors
Park L. Morse
Pages
12
Rhythm clock
Patent 3.472.018
Authors
Walter A. Papworth
Pages
5
Rhythmic cycle calculator
Patent 2.532.819
Authors
Park L. Morse
Pages
6
Rhythmic cycle calendar
Patent 2.161.345
Authors
Velma A. Gates
Pages
4
Rhythmic cycle indicator
Patent 2.494.291
Authors
James P. Fay
Pages
4
Röhrenspekulum für Frauen
Patent 365049
Authors
E.C. Albrecht Meyenberg