Millers Falls No.1, 3 & 5 eggbeater drills
Type Study
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Millers Falls No.5 eggbeater drill; 
Type 16 - The triangular Millers Falls logo and model number are stamped on either side of the crank affixing screw, along with some lines, that perhaps were used to as a substitute for a lock washer, near the crank knob.  The protected-spring, 3-jaw chuck is no longer stamped with the patent date; and the thickly red lacquered hardwood main handle has a gently rounded flare. 
The major change is in the frame, which is now made of die-cast alloy.  The pinions have a more usual pressure angle.