Cal. Code of Civil Procedure § 1203.51

Unless the context otherwise requires, the definitions set forth in this section shall govern the construction of this chapter. (a) “Person” means an individual, corporation, firm, partnership, limited liability company, or association. (b) “Owner” means a person holding any interest in the legal or equitable title or both to any leasehold for oil or gas purposes, or his or her agent and shall include purchasers under executory contract, receivers, and trustees. (c) “Contract” means a contract, written or oral, express or implied, or partly express and partly implied, or executory or executed, or partly executory and partly executed. (d) “Material” means any material, machinery, appliances, buildings, structures, casing, tanks, pipelines, tools, bits, or other equipment or supplies but does not include rigs or hoists or their integral component parts except wire lines. (e) “Labor” means work performed in return for wages. (f) “Services” means work performed exclusive of labor, including the hauling of material, whether or not involving the furnishing of material. (g) “Furnish” means sell or rent. (h) “Drilling” means drilling, digging, shooting, torpedoing, perforating, fracturing, testing, logging, acidizing, cementing, completing or repairing. (i) “Operating” means all operations conducted on the lease in connection with or necessary to the production of oil or gas, either in the development thereof or in working thereon by the subtractive process. (j) “Construction” means construction, maintenance, operation, or repair, either in the development thereof or in working thereon by the subtractive process. (k) “Original contractor” means any person for whose benefit a lien is prescribed under Section 1203.52.