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1880 – Jacques & Pierre Curie discover the piezoelectric effect
1905 – Giorgio Spezia hydrothermal growth of quartz crystals in lab
1917 – First use of the piezoelectric effect in sonar
1918 – First use of a quartz crystal in an oscillator
1926 – First broadcast transmitter with a quartz oscillator
1927 – Discovery of a thermally-compensated quartz cut
1927 – First clock with a quartz crystal
1934 – First practical thermally-compensated "AT" cut
1949 – High-Q, high-stability "AT" cut developed
1956 – First artificial synthetic quartz crystals available
1956 – Described first TCXO
1972 – Tuning-fork quartz crystal for wrist watches
1974 – Predicted "SC" cut and verified 1976