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Gerling.H, Heller.K.H, . (1974). All About Machine Tools. New Delhi: Willey Eastern.
Gerling.H, Heller.K.H, . 1974. All About Machine Tools. New Delhi: Willey Eastern.
Gerling.H, Heller.K.H, . All About Machine Tools. New Delhi: Willey Eastern. 1974.