Roger: Some phono cards are picture discs by any definition, such as
épis de blé:
http://www.lotz-verlag.de/Online-Disco-EPI.html
Thus, the technology and availability of picture discs does date back to
1904!
Other phono cards, which have simply a disc glued or stapled upon a
piece of cardboard, are obviously not.
Rainer
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Dr. Rainer E. Lotz
Rotdornweg 81
53177 Bonn (Germany)
Tel: 0049-228-352808
Fax: 0049-228-365142
Web: www.lotz-verlag.de
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