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.
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GST No. 06ALRPG1314K1Z5
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Ambala Cantt, Ambala, Haryana 
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