This was a type of brace used when a hole needed to be
drilled in a tight location, such as a corner.
The design of the brace permitted the user to turn the handle through
its full sweep when a wall or other obstruction might otherwise interfere with
this action. The basic design was first
patented in 1884.
The Millers Falls No. 502 was manufactured between 1906
and 1957, and then between 1965 and roughly 1981.