Any licence granted under section 140 shall be void,- Licence for use of

site for purpose of

1. (a) if the licensee contravenes any of the terms and conditions of licence, or Advertisement to be
2. (b) if any addition or alteration is made to, or in, the land, building, wall, void in certain hoarding, frame, post, kiosk, structure, vehicle, neon-sign or sky-sigh, cases. upon or over which the advertisement is erected, exhibited, fixed or retained, or
3. (c) If the land, building, wail, hoarding, frame, post, kiosk, structure, vehicle" neon-sign or sky-sign over which the advertisement is erected, exhibited, fixed or retained or demolished or destroyed.