An election for President of Israel was held in the Knesset on 10 April 1973. Biophysicist and politician Ephraim Katzir was elected to the position in a secret ballot and took office the same day. He held this position until 1978, when Yitzhak Navon was elected as the new president.
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Text from the Wikipedia article “1973 Israeli presidential election”, available under CC BY-SA 4.0.