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Calibration and characterization certificates: United States
 
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2003
No. 70 Prototype de masse, no 85 United States

 2001
No. 46 Helium-neon laser at 633 nm, No. 102 NIST, United States

 2000
No. 22 Prototype de masse, no 20 United States
No. 21 Prototype de masse, no 4 United States

Study Notes
2005
No. 1 Helium-neon laser at 633 nm, BIW167 Winters Electro-Optics, United States
 
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