(CANCELLED) IC 009. US 021 023 026 036 038. G & S: electrical and electronic systems for measuring and/or reducing the sound in gas lines and exhaust systems consisting of electric and electronic sensors for pressure, sound and temperature, electronic amplifiers, electric and electromagnetic actuators, electric motors, piezoelectric drives, electromagnetic and electromagnetic sound transducers, microcomputers, analog/digital convertors and digital/analog convertors; systems for heating exhaust gas consisitng of electric plasma generators, electric heating elements and electric spark plugs
(CANCELLED) IC 012. US 019 021 023 031 035 044. G & S: exhaust pipes for engines
(CANCELLED) IC 042. US 100 101. G & S: research and development in the fields of sound absorption and waste gas purification for third parties
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