LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office affirming a decision of the Examiner, rejecting all of the claims of appellants, nine in number. Claim 5 of the application is illustrative of the claims in issue, and reads as follows:
"5. In a power shovel, the combination of a boom, a dipper-handle capable of swinging movement in a substantially vertical plane, a dipper supported by the...
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