LENROOT, Associate Judge.
This appeal is taken from a decision of the Board of Appeals of the United States Patent Office, affirming the decision of the Primary Examiner in rejecting, for want of invention over the prior art, all of the claims of appellant's application, filed on June 24, 1921, numbered 1 to 13, inclusive.
Claims 1 and 7 are illustrative of the claims in issue and read as follows:
"1. The method of controlling traffic along intersecting...
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