Prevention of Food Adulteration Act, 1954–Secs. 7/16 & 20-A–Application for impleading the manufacturer–Dismissed–Dealer-firm failed to produce the bill or warranty letter to demonstrate that it has purchased the mustard oil from the manufacturer-company–In absence of such proof, it cannot be held that only the manufacturer is liable for commission of offence–Further, the trial of the case has not been commenced yet, so the application was pre-matured–Held, the application was rightly dismissed.