51 | Add to Reading ListSource URL: www.ptb.deLanguage: English - Date: 2012-08-20 08:22:41
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52 | Add to Reading ListSource URL: www.ptb.deLanguage: English - Date: 2012-05-09 02:31:16
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53 | Add to Reading ListSource URL: www.ptb.deLanguage: English - Date: 2012-05-09 02:31:16
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54 | Add to Reading ListSource URL: www.bipm.orgLanguage: English - Date: 2013-10-15 05:11:47
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55 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-09-17 11:26:18
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56 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2013-06-14 12:10:21
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57 | Add to Reading ListSource URL: www.largechamber.comLanguage: English - Date: 2012-03-05 10:13:47
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58 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-08-30 15:12:12
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59 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-09-17 11:26:46
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60 | Add to Reading ListSource URL: www.nist.govLanguage: English - Date: 2010-08-30 15:16:59
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