3 ms·
"Inventing the Negative Feedback Amplifier", IEEE Spectrum (Dec 1977) https://wiki.epfl.ch/me412-emem-2020/documents/06501721.pdf https://wiki.epfl.ch/me412-em
by HPsquared 4y ago
"Inventing the Negative Feedback Amplifier", IEEE Spectrum (Dec 1977)
https://wiki.epfl.ch/me412-emem-2020/documents/06501721.pdf https://wiki.epfl.ch/me412-emem-2020/documents/06501721.pdf
The difficulty with the patent office is on the last page.