CMS:Key System Collection: Difference between revisions
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[[File:Key System Collection.jpg|thumb|Key System Collection]] | [[File:Key System Collection.jpg|thumb|Key System Collection]] | ||
The '''Key System Collection''' contains several examples of key systems with accompanying phones | The '''Key System Collection''' contains several examples of [[Key system|key systems]] with accompanying phones. The display demonstrates how key systems were used by businesses to handle their telephone needs, and includes multi-line dial service, and intercom functionality. | ||
== Collection == | == Collection == | ||
=== 1A === | === 1A === | ||
The 1A key system was introduced in 1938 and was the first system built from individual prewired units. It replaced older systems which were essentially custom-configured for each installation from a set of approved wiring plans. 1A systems used modified 300-type desk telephones which included four- or six-button interlocking key assemblies to select various incoming telephone lines, an intercom, and a hold function. | |||
=== 1A1 === | === 1A1 === | ||
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The telephone sets used with the 1A1 display are Western Electric 564 (rotary, with round line keys). | The telephone sets used with the 1A1 display are Western Electric 564 (rotary, with round line keys). | ||
By the 1950s, key telephone systems accounted for ten percent of all sets manufactured in the United States. | |||
=== 1A2 === | === 1A2 === | ||