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- [6] Celebrating 50 years of the best technology JOURNAL OF PETROLEUM TECHNOLOGY, 1999, 51 (01): : 28 - 29
- [7] The backbone of veterinary technology for 50 years JAVMA-JOURNAL OF THE AMERICAN VETERINARY MEDICAL ASSOCIATION, 2022, 260 (10): : 1125 - 1128
- [9] 50 years of German elevator technology ZEITSCHRIFT DES VEREINES DEUTSCHER INGENIEURE, 1929, 73 : 945 - 950