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Type of slide projector that is used to display images to an audience. An overhead projector typically consists of a large box containing a very bright lamp and a fan to cool it. On top of the box is a large fresnel lens that collimates the light. Above the box, typically on a long arm, is a mirror and lens that focusses and redirects the light forward instead of up.

3M Overhead Projector Model 1720, 2500 ANSI lumens, 3 m, ENX, 360 W, 75 小時, 8.07 kg

3M Overhead Projector Model 1720. 投影機亮度: 2500 ANSI lumens. 電線長: 3 m. 燈泡類型: ENX, 燈泡功率: 360 W, 燈泡的使用壽命: 75 小時. 重量: 8.07 kg

Overhead Projector Model 1720

3M Overhead Projector Model 1720 投影儀 2500 ANSI lumens