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New Telegraph / Tapping / Morse Code Contact Key For Circuits Roti maker machine Lighting is also a fundamentalNew Telegraph Tapping Morse Code Contact Key For Circuits Illustrates the action of a switch with absolute safety. Circuit remains closed only as long as the key is depressed. Test the electronic devices in your lab. Simply connect the two lead wires to the contact posts and press the key. Mounted in a hefty plastic moulded base. Base dimensions: 2. 75 in x 3. 75 in.