I just got this information in a Facebook group from Sudip Hatua Sir, Assistant Professor at Rabindra Bharati University.
Letter issued by S. Basuray, Jt. Secretary, Govt. of WB to Directorate of Public Instruction, WB, Letter NO. 348 -Edn (CS)/1C-1666L/2005 dated 24.04.2014 regarding Service conditions and other matters related to librarians/ assistant librarians/ deputy librarians of Govt. aided college in WB. Which says-
1. The Librarian of Govt. College and the Librarians/ Assistant Librarians/ Deputy Librarians of Govt.-aided Colleges in WB shall be considered as teaching staff of the college and shall accordingly, enjoy such financial and other benefits in consonance with their work pattern, which are extended to the teachers of the colleges, from time to time...
6. The service conditions, relating to the duty hours and the nature of duties of the Librarians/ Assistant Librarians/ Deputy Librarians of Govt.-aided Colleges shall be guided by the relevant provisions of the Statue of the affiliating University. They shall continue to be treated as non-vacational teaching staff of the college....