Duotrol Trademarks

DUOTROL
COLD PERMANENT WAVING PREPARATION
Expired  ·  December 26, 1972  ·  72444467  · 
DUOTROL
AUTOMATIC ELECTRIC HYDROPNEUMATIC PUMP CONTROL FOR PRESSURE TANKS
Expired  ·  November 23, 1962  ·  72157762  · 
DUOTROL
Apparatus and Instruments for Automatic Remote Control of Refining Machines in the Preparation of Paper Stock
Cancelled  ·  November 9, 1959  ·  72084839  ·