Section 271(2)(e) in The West Bengal Motor Vehicles Rules, 1989
(e)When a design is found satisfactory, the organisation shall return two copies of the approved design, specification and calculations with its recommendations as to the maximum laden and axle weights compatible with reasonable safety to the Transport Secretary. The Transport Secretary, may then approve the design and call for as many extra copies of the approved types of the design, specifications and calculations as may be required by him for sending them to different registering authorities for their record.