Breaching Technologies Ram Breaching Door - Manual (Page 10)

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.