(a) This account must include the cost of patent rights, licenses, privileges, and other intangible property necessary or valuable in the conduct of service company operations and not specifically chargeable to any other account.

(b) When any item included in this account is retired or expires, the related book cost must be credited to this account and charged to account 426.5, Other deductions (§367.4265), or account 111, Accumulated provision for amortization of property (§367.1110).

(c) This account must be maintained in a manner so that the service company can furnish full information with respect to the amounts included in this account.