THe operator is making end bars for extraction super frames, for a standard Langsworth style hive.They're not long enough for deep supers.
The parts are the two ends of a frame. The top bar and split bottom bar will be nailed into the notches on the end bars.
A sheet of wax foundation will go into the frame and wires, or clips will hold it in. Drilling holes in the end bars is the next step.
He is doing it on some type of a multi blade saw. The top and bottom notches are plowed with a dado, or shaper.
"The first thing you need to know, will likely be the last thing you learn." (Unknown)