WASHINGTON - The Bureau of Change of Control said Sunday that a coding shop with a new landlord must have its model jacks unplugged. Clerks coil each cord into a numbered bag. Completions stop until a new lease is stamped at the window. Under Circular CC-11, a change of landlord is a change of the contract. The model may not emit through a jack whose premises file has a new owner line. A clerk reads the deed and removes the wall plate; the coiled cord goes into a canvas bag tagged with the shop's docket number. "The jack is the agreement," said Owen Pratt, counsel to the bureau. "A cord left in the wall after the landlord changes is an unfiled completion. We do not certify unfiled completions." Labs may keep supplying models to coding shops when the lease card at the window matches the plate on the wall. A staffer at one frontier lab, not authorized to speak, said bags from Friday's filings now fill a wire cage in the corridor. The rule takes effect 12 November for all coding windows in the capital district. After the first week of unpluggings, the bureau will issue a specimen bag tag.