1880 Piezoelectric effect discovered by Jacques and Pierre Curie
1905 First hydrothermal growth of quartz in a laboratory - by G. Spezia
1917 First application of piezoelectric effect, in sonar
1918 First use of piezoelectric crystal in an oscillator
1926 First quartz crystal controlled broadcast station
1927 First temperature compensated quartz cut discovered
1927 First quartz crystal clock built
1934 First practical temp. compensated cut, the AT-cut, developed
1949 Contoured, high-Q, high stability AT-cuts developed
1956 First commercially grown cultured quartz available
1956 First TCXO described
1972 Miniature quartz tuning fork developed; quartz watches available
1974 The SC-cut (and TS/TTC-cut) predicted; verified in 1976
1982 First MCXO with dual c-mode self-temperature sensing