TY - JOUR T1 - Effect of Modifications on the Performance of Helical Gears A1 - Koura, Omar Monir Y1 - 2021 PY - 2021 DA - 2021/11/13 N1 - doi: 10.12691/ajme-9-1-6 DO - 10.12691/ajme-9-1-6 T2 - American Journal of Mechanical Engineering JF - American Journal of Mechanical Engineering JO - American Journal of Mechanical Engineering SP - 57 EP - 68 VL - 9 IS - 1 PB - Science and Education Publishing SN - 2328-4110 M3 - doi: 10.12691/ajme-9-1-6 UR - http://pubs.sciepub.com/ajme/9/1/6 Y2 - 2021/11/13 ER -