Engelin Manopo, M. ., Khaddafi, M. . and Indrayani, I. (2022) “OPTIMIZATION OF MANPOWER IN SEAMLESS PIPE THREADING MANUFACTURE BATAM”, International Journal of Social Science, Educational, Economics, Agriculture Research and Technology (IJSET), 1(2), pp. 57–64. doi: 10.54443/ijset.v1i2.7.