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In the past, some comb binding machines would come with a wire closer. These machines were designed to be used with 19-loop wire, which uses the same pattern as for plastic comb binding. This hole pattern will have 19 longer rectangular holes that are on 14 mm (9 ⁄ 16 in) centers, for a total length of 280 mm (11 in).
Spiral Binding Company, started in 1932, was "the first mechanical binding company in the United States". [2] It created the original metal spiral-coil binding and later the Spiralastic, a popular plastic coil to replace wire during World War II. [ 3 ]
General Binding Corporation (GBC) is a business machines and supplies manufacturer which makes equipment and supplies for binding, lamination, and other presentation products. The company is part of ACCO Brands and is headquartered in Lake Zurich, Illinois .
Spiral coil binding uses a number of different hole patterns for binding documents. The most common hole pattern used is 4:1 pitch (4 holes per inch). However, spiral coil spines are also available for use with 3:1 pitch, 5:1 pitch and 0.400-hole patterns.
In bulk applications, a paper drilling machine may be used. Then the user chooses a spine size that will match the document. Standard sizes are 4.8 mm ( 3 ⁄ 16 in) (for 16 sheets of 20# paper) up to 51 mm (2 in) (for 425 sheets).
Carbon film resistors feature lower noise compared to carbon composition resistors because of the precise distribution of the pure graphite without binding. [6] Carbon film resistors feature a power rating range of 0.125 W to 5 W at 70 °C. Resistances available range from 1 ohm to 10 megaohm.
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