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==History==
Many [[vacuum tube]] computers had FRUs:
*
Most [[transistor]]ized and [[integrated circuit]]-based computers had FRUs:
* [[Computer module]]s, circuit boards containing discrete transistors and various passive components. Examples:
** [[
** [[System Building Blocks|DEC System Building Blocks]] cards
** [[Flip
* Circuit boards containing monolithic ICs and/or [[hybrid integrated circuit|hybrid ICs]], such as [[
Vacuum tubes themselves are usually FRUs.
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==Trends==
As the sophistication and complexity of multi-replaceable unit electronics in both commercial and consumer industries have increased, many design and manufacturing organizations have expanded the use of the FRU storage device.{{definition needed|date=August 2019}}
==See also==
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