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Alle
- Sony - official catalogs 1966-2008
- sample of books relating audio domain
- J. Bardeen, W. Brattain, W.Shockley - transistor' inventors
- dr. Karl Daniel - inventator si promotorul casetei fara sfarsit/endless cassette inventor & promoter
- ca1976.g. Transylvania CR304
- Allied electronics + Lafayette radio electronics = sample of distributors catalogs 1953-1974
- 1995.e. Sony MHC-450
- 1995.a. Philips AZ8040
- 1988.d. Electronica Sistem Compact Stereo 001
- 1987.f. Tehnoton Condor 622
- 1987(?).c. Felix 3810
- 1985.a. Philips D7547
- 1984.e. Sony WM-F45
- 1983.c. Philips D7162
- 1980.i. Philips LFH0186