3-Terminal Medium Base Turn Knob Socket Interior for Wiring Bottom Light (48206i) - Antique Lamp Supply - Quality Lamp Parts Since 1952
3-way lamp - Wikipedia
3 way switch with power source via the light switch | How to wire a light switch | Electrical switch wiring, Light switch wiring, Electrical switches
JUTOROSY 3 Way Lamp Socket Replacement, UL Listed Lamp Switch Replacement E26/E27 Light Socket Medium Base Interior Only with Turn Switch Knob, Lamp Repair Kit for Table Lamps, Floor Lamp, 2-Pack -