ramdhani ade yanyan, Maya Novian Sridara Lutfi. Analysis of Quality Control for Defective Exhaust Manifold Products in the Casting Process Using the Seven Quality Control Tools. tekmapro [Internet]. 2025Sep.28 [cited 2025Oct.1];20(2). Available from: https://tekmapro.upnjatim.ac.id/index.php/tekmapro/article/view/882