"Harold Chestnut"@en . . . . "Chestnut, Harold"@en . "2001Z"^^ . "2001-08-29Z"^^ . "American engineer" . . . . . "Harold (Hall) Chestnut (November 25, 1917 \u2013 August 29, 2001) was an American electrical engineer, control engineer and manager at General Electric and author, who helped establish the fields of control theory and systems engineering."@en . "1917Z"^^ . "1917-11-25Z"^^ .