The mechanism of addition and subtraction in the industrial product and its relation to employment pressure: بـــان محمد شـاكر الطائي. jcofarts [Internet]. 2016 Mar. 20 [cited 2025 May 10];(77):245-62. Available from: https://www.jcofarts.uobaghdad.edu.iq/index.php/jcofarts/article/view/743