DEVICE FOR PREVENTION OF UNPLEASANT SOUND IN CATTLE STALL FOR BREEDING CATTLE SUCH AS OXEN AND HORSES, CATTLE STALL EQUIPPED THEREWITH, PREVENTION OF UNPLEASANT SOUND THEREBY IN SAME CATTLE STALL AND SYSTEM THEREFOR

摘要

PURPOSE: To smoothly breed cattles by preventing generation of electromagnetic sound making the cattles unpleasant. ;CONSTITUTION: Generation of electromagnetic sound having a wavelength beyond the range of the audio frequency, incapable of being heard to a human, capable of being heard to cattles and making the cattles unpleasant is prevented. Generation of the electromagnetic sound making cattles unpleasant can be prevented by attaching an inverter to various kinds of equipments related to breeding, e.g. a ventilation fan, an indoor air-agitator and an air-conditioner.;COPYRIGHT: (C)1994,JPO&Japio