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1992 August 2, Peter H. Lewis, “Low-Tech Renewal”, in The New York Times, →ISSN:
The reality is that the typical classroom teacher still uses a blackboard and chalk. Indeed, despite the excitement over high-tech devices, most classroom equipment is decidedly low-tech: small-screen television sets, mimeograph machines, monaural phonograph record players, overhead projectors with grease pencils, 16-millimeter projectors, reel-to-reel tape players, filmstrip projectors.
overhead projector on Wikipedia.Wikipedia 