"queueing"

[Warren Block]

Dictionaries do not accept "queueing" as an acceptable spelling of the 
word, yet there are 289 instances of it being spelled that way in HEAD. 
Only 203 times is it spelled correctly, with a single "e": queuing.

Could this have been an intentional industrial misspelling for 
copyright/trademark reasons, or is this just a word that got started 
wrong and cut and paste has multiplied the error?