E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/44
E21B 43/12 (2006.01)
Patent
CA 305211
George Spencer Flanders
Mervyn Aleck Ap Rhys Pryce
Na
Naamlooze Vennootschap de Bataafsche Petroleum Maatschappij
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