National Audio Company Inc. - Q: What's a Duplication Master? National Audio duplicates cassette tapes on high-speed, studio-quality, open-reel tape recorders known as duplicating slaves. This produces cassettes with a higher output
500+ BULK CASSETTE DUPLICATION - Tapeline Ltd
Recordex USA Soundmaster IV - 1-4 Cassette Duplicator 600 B&H
Analogue cassette tape duplication and production from reel to reel tapes | Band Cassettes