This film is the fourth collaboration between Amitabh Bachchan, Shashi Kapoor and director Yash Chopra after the hugely successful Deewaar (1975), Kabhie Kabhie (1976) and Trishul (1978).
Ravi Malhotra, Engineer:
All right. I' ll answer your questions, one at a time. Coal is mostly used in ovens. There are two types of coal. The first is black in color and the other is black, too. So they' re both alike. As for how it is made, you must have heard the saying,...