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File:Patent-GB-334913.pdf |ApplicationNum=18018/29 |Marca=Columbus(1 295 × 1 752 (138 KB)) - 01:20, 12 dic 2021File:1936-AnnuarioPolitecnicoItaliano-p0902.jpg |Source=https://books.google.it/books?id=M1Hmh_OJqrMC |Paese=IT(4 590 × 6 216 (2,5 MB)) - 19:21, 20 ago 2023