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http://en.wikipedia.org/wiki/File:Relay2.jpghttp://en.wikipedia.org/wiki/File:Relay2.jpghttp://en.wikipedia.org/wiki/File:Relay_Parts.jpghttp://en.wikipedia.org/wiki/File:Relay_Parts.jpghttp://en.wikipedia.org/wiki/Coilhttp://en.wikipedia.org/wiki/Magnetic_corehttp://en.wikipedia.org/wiki/Magnetic_reluctancehttp://en.wikipedia.org/wiki/Armature_(electrical_engineering)http://en.wikipedia.org/wiki/Spring_(device)http://en.wikipedia.org/wiki/Printed_circuit_boardhttp://en.wikipedia.org/wiki/Electric_currenthttp://en.wikipedia.org/wiki/Magnetic_field -
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http://en.wikipedia.org/wiki/File:Latching_relay_bistable_permanent_magnet.jpghttp://en.wikipedia.org/wiki/File:Latching_relay_bistable_permanent_magnet.jpghttp://en.wikipedia.org/wiki/Arcinghttp://en.wikipedia.org/wiki/Direct_currenthttp://en.wikipedia.org/wiki/Diodehttp://en.wikipedia.org/wiki/Voltage_spikehttp://en.wikipedia.org/wiki/Semiconductorhttp://en.wikipedia.org/wiki/Snubberhttp://en.wikipedia.org/wiki/Alternating_currenthttp://en.wikipedia.org/wiki/Relay#cite_note-0http://en.wikipedia.org/wiki/Thyristorhttp://en.wikipedia.org/wiki/Optocouplerhttp://en.wikipedia.org/wiki/Light-emitting_diodehttp://en.wikipedia.org/wiki/Photo_transistorhttp://en.wikipedia.org/wiki/Solenoid -
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http://en.wikipedia.org/wiki/File:Reedrelay.jpghttp://en.wikipedia.org/wiki/File:Reedrelay.jpghttp://en.wikipedia.org/wiki/Reed_relayhttp://en.wikipedia.org/wiki/Reed_switchhttp://en.wikipedia.org/wiki/Vacuumhttp://en.wikipedia.org/wiki/Inert_gashttp://en.wikipedia.org/wiki/Corrosionhttp://en.wikipedia.org/wiki/Mercury_(element)http://en.wikipedia.org/wiki/Mercury_switchhttp://en.wikipedia.org/wiki/Crossbar_switchhttp://en.wikipedia.org/wiki/Crossbar_switch -
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http://en.wikipedia.org/wiki/File:Solid_state_relay.jpghttp://en.wikipedia.org/wiki/File:Solid_state_relay.jpghttp://en.wikipedia.org/wiki/Form_factorhttp://en.wikipedia.org/wiki/Programmable_logic_controllerhttp://en.wikipedia.org/wiki/Contactorhttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Silverhttp://en.wikipedia.org/wiki/Silver_oxidehttp://en.wikipedia.org/wiki/Relay#cite_note-1http://en.wikipedia.org/wiki/Solid_state_(electronics) -
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http://en.wikipedia.org/wiki/File:Solid-state-contactor.jpghttp://en.wikipedia.org/wiki/File:Solid-state-contactor.jpghttp://en.wikipedia.org/wiki/Solid_state_relayhttp://en.wikipedia.org/wiki/Solid_state_(electronics)http://en.wikipedia.org/wiki/Electromechanicalhttp://en.wikipedia.org/wiki/Amperehttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Programmable_logic_controllerhttp://en.wikipedia.org/wiki/Transistor-transistor_logichttp://en.wikipedia.org/wiki/Transistor-transistor_logichttp://en.wikipedia.org/wiki/Buchholz_relayhttp://en.wikipedia.org/wiki/Transformer -
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http://en.wikipedia.org/wiki/File:Relay_symbols.svghttp://en.wikipedia.org/wiki/File:Relay_symbols.svghttp://en.wikipedia.org/wiki/Relay#cite_note-2http://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Electric_motorhttp://en.wikipedia.org/wiki/Bimetallic_striphttp://en.wikipedia.org/wiki/Solderhttp://en.wikipedia.org/wiki/Switch -
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http://en.wikipedia.org/wiki/Actuator -
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http://en.wikipedia.org/wiki/File:ACRelay.jpghttp://en.wikipedia.org/wiki/File:ACRelay.jpghttp://en.wikipedia.org/wiki/Modemshttp://en.wikipedia.org/wiki/Electric_currenthttp://en.wikipedia.org/wiki/Starter_motorhttp://en.wikipedia.org/wiki/Solenoidhttp://en.wikipedia.org/wiki/Automobilehttp://en.wikipedia.org/wiki/Circuit_breakershttp://en.wikipedia.org/wiki/Ladder_programming_languagehttp://en.wikipedia.org/wiki/Vacuum_tubeshttp://en.wikipedia.org/wiki/Transistorshttp://en.wikipedia.org/wiki/Digital_computerhttp://en.wikipedia.org/wiki/ARRA_(computer)http://en.wikipedia.org/wiki/Harvard_Mark_IIhttp://en.wikipedia.org/wiki/Harvard_Mark_IIhttp://en.wikipedia.org/wiki/Zuse_Z2http://en.wikipedia.org/wiki/Zuse_Z3 -
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http://en.wikipedia.org/wiki/File:Uy-multi1-hy.jpghttp://en.wikipedia.org/wiki/File:Uy-multi1-hy.jpghttp://en.wikipedia.org/wiki/File:Phonerelay.pnghttp://en.wikipedia.org/wiki/File:Phonerelay.pnghttp://en.wikipedia.org/wiki/Dashpothttp://en.wikipedia.org/wiki/1XB_switchhttp://en.wikipedia.org/wiki/5XB_switch -
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http://en.wikipedia.org/wiki/Explosion_proofhttp://en.wikipedia.org/wiki/Printed_circuithttp://en.wikipedia.org/wiki/Printed_circuithttp://en.wikipedia.org/wiki/Accelerationhttp://en.wikipedia.org/wiki/Aerospacehttp://en.wikipedia.org/wiki/Shock_(mechanics)http://en.wikipedia.org/wiki/G-force -
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http://en.wikipedia.org/wiki/File:Rail_Signalling_Relay_Q-style.JPGhttp://en.wikipedia.org/wiki/File:Rail_Signalling_Relay_Q-style.JPGhttp://en.wikipedia.org/wiki/File:Relay_room.jpghttp://en.wikipedia.org/wiki/File:Relay_room.jpghttp://en.wikipedia.org/wiki/Protective_relayhttp://en.wikipedia.org/wiki/Railway_signallinghttp://en.wikipedia.org/wiki/Double_switchinghttp://en.wikipedia.org/wiki/Double_switching -
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http://en.wikipedia.org/wiki/Opto-isolatorhttp://www.machine-information-systems.com/How_PLCs_Work.htmlhttp://www.machine-information-systems.com/How_PLCs_Work.html -
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http://www.barn.org/FILES/historyofplc.html
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