During the decades 1950 era has invented artificial devices for high performance projection up. There can be more opaque projector. From transparencies projector, and slide projector
In the early 1950s, has invented a device for projecting a high rage. There can be more opaque projector. The projector transparencies from And projector
During the decade 1950 have invented invented a device for projecting powerful higher up. Have more abilities as opaque projectors, projector from the transparency and เครื่องฉายภาพสไลด์.