BASF Inventor's Notebook by Terence O'Kelly

With a kind permission from the author.

The Technical Argument for Chromium Dioxide (PDF file 1.9Mb)

Technical bulletin #2 - Meters and Measurements (PDF file 200kB)

Technical bulletin #3 - Bias (PDF file 670kB)

Technical bulletin #4 - EQ (PDF file 350kB)

Technical bulletin #6 - The Cassette Housing (PDF file 1.1Mb)