Submerged repeater amplifier, 1967
1967
1967
(1962); 1982
1968
1969
1968
1968
2000-100 BCE
1969
1969
1967
1968
1969
1969
1968
1986 (replica); 1501-1600 (original)
1966
1969
1990-96
1968
4000-2001 BCE
1966
1966
circa 1968
1967
1966
1967
1903 (original); 1982 (model)
1966
1967
1830 (original); 1967 (model)
1966
1969
1967-1968
1971-1900
1967
1967
1967
1967
circa 1966
1969
1968-1969
1966
circa 1967
circa 1966
circa 1967
1969
1967
circa 1967
1968
1966