Patent 1323531 Dec 2 1919 Edward R. Hewitt – engine manifold vacuum tester. patent 1950052 Mar 6 1934 Butler J. Haskins – automotive engine diagnostic device.
Vintage Compression Tester Model No. 5 Harvey E. Hanson CO. Paw Paw, Mich. USA
Matco Tools Vintage Compression Tester CT66 With Case
Vintage Compression Tester Gauge w/ Hose 0-300 PSI Dial 32881 Tool
Vintage Compression Tester & Engine vacuum/Fuel Pump Pressure Gauge
Vintage Compression Tester 300 Lbs Model # 3335
Hastings Piston Rings Vintage Compression Tester (UW4/JSF6) AC-4140 USA Sherlock
