The Wollensak brand was used by the 3M corporation for a series of educational cassette recorders and high-speed cassette duplicators between 1973 and 1983. Wollensak 3M Tape Recorders designed for classroom use
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Vtg Wollensak 3m Cassette Tape Deck System in Working Condition Photo #1377030 - US Audio Mart
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Wollensak 3M Cassette System Model 2551 (UB3-HS) | EstateSales.org
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Wollensak 3M Cassette System Model2866AV | Acheter sur Ricardo
Wollensak 3M 2551 AV Heavy Duty Cassette System Recording In Green Cas
Vintage Wollensak 3M Model 2570 AV Cassette Recorder System for Projectors | eBay
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Wollensak 3M 2551 AV Heavy Duty Cassette System Recording In Green Cas
WOLLENSAK 3M MODEL 4155 AC/DC Cassette Recorder - Tested £17.14 - PicClick UK
Vintage Wollensak 3M Model 2570 AV Cassette Recorder System - electronics - by owner - sale - craigslist