"Rotary wafer switch design, maintenance, and repair kit. The various metal bits fit into the flat, non-conductive wafers arranged along a circular path. The shafts connect the individual wafers to conduct electricity between the metal bits.

I've never seen a kit like this so well-stocked. Half a century ago, it was an inexpensive way to direct signals to multiple connections. Switches like these are becoming obsolete as digital electronics take their place, but you can still find them on low-level appliances like washers and dryers; many are still using the 'clunk, clunk, clunk' rotary switches instead of soft-touch push buttons."

"A rotary switch kit. You can make different amounts of poles and different amounts of positions. The manufacturer is CRL/Centralab."