THORPNICS: Flip-flop or bistable latching using relays.
Latching Relay Basics - The Engineering Mindset
Relay Toggle flip flop - CircuitLab
Relay-Based ON/OFF Flip-Flop Remembers State During Power Failure | Electronic Design
Flip Flop Relay | Circuit Diagram
latching - Single push button relay with reset - Electrical Engineering Stack Exchange
Relay Driver with Flip-Flop | Download Scientific Diagram
RS Flip-Flop Relays Circuit | RS Flip-Flop Relays Circuit | By Young English Engineer | Facebook | Young English engineer your way to the electronics world like our Facebook page and learn
Relay Circuit Design
Creating a Flip Flop Circuit in the PLC | ACC Automation