What does SCR stand for?

MLA style: "SCR." Acronym Finder . 2012. AcronymFinder.com 11 Feb. 2012 http://www.acronymfinder.com/Secondary-Clock-Reference-(SCR).html
Chicago style: Acronym Finder . S.v. "SCR." Retrieved February 11 2012 from http://www.acronymfinder.com/Secondary-Clock-Reference-(SCR).html
APA style: SCR. (n.d.) Acronym Finder. (2012). Retrieved February 11 2012 from http://www.acronymfinder.com/Secondary-Clock-Reference-(SCR).html

Secondary Clock Reference

This definition appears very rarely and is found in the following Acronym Finder categories:

Other Resources:

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Science & Consciousness Review (journal) Science Concept Review Scientific Computing and Research, Inc. Scientific Council Research Documents (NAFO) scratch Screen Screener Screw Script (File Name Extension) Sea Containers Ltd.		Security Change Request Security Council Resolution (United Nations) Selective Call Rejection (also seen as SCRJ; telecommunications) Selective Catalytic Reduction Selective Chopper Radiometer Semi-closed Circuit Rebreather (SCUBA) Senate Concurrent Resolution Send a Cow Rwanda Senior Combination Room (some UK universities) Senior Command Representative

Samples in periodicals archive:

The secondary clock reference is required for fail-over protection, an important feature in carrier-class communication systems.