No. 5. Factories. 1955. "air receiver meaps- (a) any vessel (other than a pipe or coil, or an accessory, fitting or part of a compressor) for containing compressed air and connected with an air compressing plant; or (b) any fixed vessel for containing compressed air or compressed exhaust gases and used for the purpose of starting an internal combustion engine; or (c) any fixed or portable vessel (not being part of a spraying pistol) used for the purpose of spraying by means of compressed air any paint, varnish, lacquer or similar material; or (d) any vessel in which oil is stored and from which it is forced by compressed air; bodily injury includes injury to health; "building operation" means the construction, structural alteration, repair or maintenance or a building (including re-pointirig, re-decoration and external cleaning of the structure) the demolition of a building, and the preparation for, and laying the foundationtof, an intended building, but does not include any operation which is a work of engineering construction within the meaning of this Ordinance; "Inspector" means the inspector, appointed under this Ordin- ance; class or description 7, in relation to factories, includes a group of factories described by reference to locality; "contravention" includes in relation to any provision a failure to comply with that provision and the expression contravene" shall be construed accordingly; driving-belt" includes any driving strap or rope; fume includes gas or vapour; harbour" includes harbours properly so called, whether natural or artificial, piers jetties and other works in or at which ships can obtain shelter, or ship or unship goods or passengers; "machinery includes any driving-belt; "maintained means maintained in an efficient state, in efficient working orde--, and in good repair; "owner means the person for the time being receiving the rents or profits of the premises in connection with which the word is used, whether on his own account or as agent or trustee for any other person, or who would so receive the same if the premises were let; "parent" means a parent or guardian of, or person having the legal custody of, or the control over a, child or young person, any person having direct benefit from his wages; and includes in relation to any such child or young person;