Thud and Blunder in "Knock-Off Time"
- साल: 1964
- देश: United Kingdom
- शैली: Animation
- स्टूडियो: National Coal Board Film Unit, BFI, TVC London
- कीवर्ड: safety, coal mining, miners, civil disobedience, collier, psa, public information film
- निदेशक:
- कास्ट: