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ECH81 - Triode - Heptode 1954
page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ECH81 sheet 1 2 3 4 5 A B C D E F G H I J K L M FP date 1954.06.06 1954.06.06 1958.06.06 1958.0.ECH81 - Triode - Heptode 1969
page 1 2 3 4 5 6 7 ECH81 sheet 1 2 3 4 5 6 FP date 1969.12 1969.01 1969.01 1969.01 1969.01 1969.01 1999.08.15 .ECH81 - Oscillator
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