I see that you are from Spain, but as far as I know it was his name, it's as simple as that.
I have started a thread regarding Burton Spain on this board,
here you may see it and - hopefully - you can read and learn more about Burton there.
He has written two books/booklets, one contains his personal notes and other pool and non pool related writings. The other booklet is about his works, full splice cue construction and he writes very interesting things about other cue makers.
Burton Spain has built hundreds of pool cue blanks for George Balabushka (approx. 500 to 600) and has taught Joel Hercek - one of the most respected cue makers of our time. [you may read about Burton on
Joel's site as well, just look around there]
Burton has perfected full splice cues, he came up with the double-splice idea which has led to better balanced and weighted full splice cues built using ebony and maybe other heavier woods.
He came up with many interesting designs and ideas throughout his nearly 30 years that he has spent on and off with cue making (from 1965 to 1994)
Finding a perfect condition, unplayed Spain cue is extremely difficult and such a cue would be one of the most treasured pieces of any collection.