Merging 'Lisp Machine Lisp' into the 'Lisp Machine' article is not a good idea. 'Lisp Machine Lisp' was a dialect developed at MIT. Lisp Machines existed from other places (Xerox, France, Japan, ...) which did not use this language. The language 'Lisp Machine Lisp' could also be documented in more detail, as it is a significant dialect which was influenced by Maclisp and later influenced Common Lisp. The Xerox Lisp Machine for example used a very different Lisp dialect called Interlisp, which is also a very interesting language in its own right.
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