9 Electronic, electromechanical and electrochemical products, namely, devices that utilize either or both rectilinear motions of charged particles and electrical and electronic devices that utilize rotational, precessional and nutational motions of charged particles that are responsible for the spin and spin wave characteristics of charged particles and particle interactions, with these characteristics engineered for use in communications and signal processing, namely, electric circuit cards, RF (radio frequency) oscillators, power amplifiers, RF (radio frequency) modulators, RF (radio frequency) demodulators, power supplies, audio signal filters, audio signal interfaces, and RF (radio frequency) signal interfaces; electronic apparatus, namely, audio tapes, video tapes, digital video discs, CDs, and software featuring information in the nature of descriptions and diagrams of the aforementioned devices and technology