`whenYear` >='-3000'
AND `whenYear` <='3000'
AND
( `whoCharName` = 'Electromechanical Relay ' or `whoRel` = 'Electromechanical Relay ' or `whereLoc` = 'Electromechanical Relay')
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,
300

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1835

Joseph Henry
Electromechanical Relay
in 1835
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301297

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