YES, the lower front guard hole is a REGISTERED TRADEMARK of Busse Knife Co.
When we discuss legal matters with other manufacturers we prefer to handle these issues in a private and professional manner.
I can tell you that ALL of the manufacturers who have used the mark and who were contacted by us, have been very cooperative in removing the mark from there product line. In all cases thus far, the behavior of the gentlemen contacted has been commendable.
Some of the manufacturers that were mentioned in this thread as still using the mark, DO NOT continue to use our trademarked guard hole.
Jerry