The following terms have the meanings indicated:
means plants wherein asphalt, tar or other petroleum products or by-products are prepared or mixed, either along or with other ingredients, as a material for paving or surfacing.
means plants where water, gravel, sand, crushed stone or other aggregate is mixed with cement and placed within a truck or trucks for the purpose of mixing such ingredients and to create and manufacture concrete thereby while such truck is in transit to its ultimate point of delivery.
means any place where gravel, sand or dirt, or any combination thereof, is removed from its natural state of deposit by digging, pushing or any other method whether herein specified or not, and sold or held for sale.
means any place where materials, consisting in whole or in part of rock or stone, are removed from their natural state by cutting, blasting, digging or pushing, or by any other method whether herein specified or not, and sold or held for sale.