Passive voice practice By mecorbo@hotmail.com Sep 28, 1928 Fleming discovers penicillin. Jun 17, 1946 Bell Labs inaugurates Mobile Telephone Service, one of the earliest standards for mobile communication. Apr 12, 1955 Salk announces the polio vaccine. Oct 4, 1957 The Russians launch Sputnik 1 Dec 20, 1957 A Boeing 707 flies for the first time. Jan 31, 1958 The Americans launch Explorer 1 Oct 26, 1958 PanAm schedules the first Boeing 707 commercial flight. Oct 17, 1959 The Russians christen the K-19 submarine. Jul 12, 1960 The Russians raise the naval flag on the K-19 submarine. Nov 1, 1964 Bell Labs inaugurates the IMTS (Improved Mobile Telephone Service).