Printing in East Asia evolved from ink rubbings made on paper or cloth from texts on stone tables in China during the Han dynasty. Mechanical woodblock printing on paper started in China during the Tang dynasty before the 8th century CE. Use of woodblock printing quickly spread to other East Asian countries. While the Chinese used only clay and wood movable type at first, use of metal movable type was pioneered in Korea by the 13th century. The Western-style printing press became known in East A
Definition of 'overhead projector'. overhead projector. An overhead projector is a machine that has a light inside it and makes the writing or pictures on a sheet of plastic appear on a screen or wall. The abbreviation OHP is also used. COBUILD Advanced English Dictionary.
Overhead hoists are a basic and versatile piece of equipment used in manufacturing, warehousing, construction and numerous other applications to aid workers in the handling and moving of loads. Overhead hoists are available in various types of configurations and constructions. Overhead hoist types are usually referred to using terms that define a specific configuration and construction. Three areas that further define the hoist type are: Lifting Medium: Lifting medium defines the type of component used to transmit and cause vertical motion of the hoist load hook or hoist load block.