Template:Selected anniversaries/April 4
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1826: Electrical engineer Zénobe Gramme born. He will invent the first usefully powerful electric motor.
1901: Charles Hermite publishes paper on number theory as deterrent to crimes against mathematical constants.
1976: Engineer and theorist Harry Nyquist dies. He did early theoretical work on determining the bandwidth requirements for transmitting information, laying the foundations for later advances by Claude Shannon, which led to the development of information theory.