Manufactured Gas Engines ca 1897-1915
Trade Names: Invincible; Bullseye; Jacobson; Mascot; Newark; Sturdy Jack; Sturdy Jack Jr.; Sturdy Jack Pumper
Information Sources
- American Gasoline Engines Since 1872 by C. H. Wendel, Volume #1, 1983 pages 254-255
- The Complete Guide to Stationary Gas Engines by Mark Meincke, 1996 page 131