Abstract: A method for preventing theft of a vehicle using intensive marking comprises, establishing a service network (10) including a service center (12) having a databank (14) for data processing and storage, and a number of service stations (16) providing anti theft service to clients. At the service stations, an agent provides a particular intensive marking (42) alphanumerical code to the vehicle which identifies the region of origin of the vehicle owner and includes a sequential number corresponding to the particular vehicle identification number. The intensive marking alphanumerical code is permanently marked (62) on about 50 of the most saleable parts of the vehicle in order to reduce the black-market value thereof. The vehicle is also provided with visible logo (21) identifying the vehicle anti theft service rendered to this vehicle, thereby deterring theft.

Abstract: An improved portable abrasive blasting gun assembly which comprises a gun part having a compressed air conduit and an abrasive material conduit intersecting with one another to produce an abrasive carrying air jet. A protective housing is detachably secured to the gun. The housing has an abrasive blasting orifice and a vacuum conduit in a side wall of the housing for removal of abrasive particles from the housing. The improvement in the assembly comprises an adapter barrel for interconnecting the gun part to the protective housing and permitting angular displacement of said abrasive carrying air jet along a predetermined plane. The barrel has a straight conduit therein and a gun securing portion to removably secure same to the gun. The barrel also has a nozzle end portion and a swivel connecting portion.