This picture better shows the beautiful colours of each of the cutouts, while the previous picture shows the internal workings of each unit.

The Duncan marked piece has no other markings to indicate volts and amp capacity. The knife is withdrawn by rotating the handle to the left, then pulling down.

The middle unit is unmarked. It is a very unusual style, and you can see where the mounting bracket fitted over the middle rib. The handle is rotated and pulled down to break / open the circuit.

The cut-out on the right is by S & H of Chicago. A 2500 volt, 100 amp unit, the wire bail slips off the end of the handle to open the unit. It shows patent dates of 1912 and 1915, plus others pending marked on the top exterior.

Again, thanks to Lou Hall. I'll take good care of them