The Bethlehem Spark plug was originally manufactured by Silvex corporation based in South Bethlehem, Pennsylvania. About 1918 they received a contract from Ford Motor Company to supply a quantity of spark plugs for Model T Ford and Fordson production, supplanting the contract given to Champion Spark Plug which was the prime supplier. At the time the chairman of Silvex / Bethlehem was Edward H Schwab. You may have heard of his brother, Charles Schwab who was president of Bethlehem Steel Company. The advertisement above is for one of the company’s “gimmick plugs” which had multiple ground electrodes instead of the normal single ground electrode.
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