audiodisc, were the manufactures of the blank discs, i think the "audiodisc" trade mark was leased out to various disc manufacturers as i have got one that lists capitol magnetics, winchester, va. as the address on the label, and a couple that list audio devices, 444 madison avenue, new york, as the address, later on they were bought out by transco, who were bought out by apollo masters, who are the currant owners