Breaching Technologies Saloon Explosive Breaching Door - Manual (Page 14)

End Use License Agreement
BTI Breaching Doors are manufactured using a patented socket or
panel system installed in the frame and door. It should be specifically
noted that the Purchaser must use the BTI patented engineered pins or
panels when breaching the door. Any use of a substitute product is
strictly prohibited and would constitute a violation of BTI policy and
thereby be in default of this Licensing Agreement notification. The
proprietary information provided on the Serial Number plate attached
to each door is meant to serve as a notification of the BTI Licensing
Agreement.