The X-09 combination lock met the requirements of Federal Specification FF-L-2740A. Kaba Mas responded to the June 2011 update of the specification (FF-L-2740B) with the development of the X-10. The X-10 was approved by the General Services Administration (GSA) in April of 2013. Kaba Mas has supported both X-09 and X-10 locks with parts and service since that time.
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