Timeline for Koeckert

Year	Violin I	Violin II	Viola	Cello
1939	Rudolf Koeckert	Willi Buchner	Oskar Riedl	Josef Merz
1965	Rudolf Koeckert	Rudolf-Joachim Koeckert	Oskar Riedl	Josef Merz
1975	Rudolf Koeckert	Rudolf-Joachim Koeckert	Franz Schessl	Josef Merz
1976	Rudolf Koeckert	Rudolf-Joachim Koeckert	Franz Schessl	Helmar Stiehler
1982	Rudolf-Joachim Koeckert	Rudolf-Joachim Koeckert	Franz Schessl	Helmar Stiehler
1992 ended