Awanees Samuel Awanees Derdrian, N., Kh. Zeki, M. and I. Alabdullah, A. (2022) “The Effect of the Iron Arm’s Relative Position to the Pole piece Tip Position on the Objective Snorkel Lens Type”, Rafidain Journal of Science, 31(4), pp. 39–46. doi: 10.33899/rjs.2022.176071.