Section 48(1)(c) in The West Bengal Industrial Infra-Structure Development Corporation Act, 1974
(c)where the person to be served is a statutory public body or a Corporation or a Society or other body, if the document is addressed to the secretary, treasurer or other principal officer of that body, Corporation or Society at its principal office, and is either-(i)sent under a certificate of posting or by registered post, or(ii)left at the office;