What follows is an opinion from a United States Court of Appeals. Your task is to identify the federal agency (if any) whose decision was reviewed by the court of appeals. If there was no prior agency action, choose "not applicable".

Opinion:
NATIONAL CASH REGISTER COMPANY, Petitioner, v. NATIONAL LABOR RELATIONS BOARD, Respondent.
No. 18283.
United States Court of Appeals Sixth Circuit.
Jan. 8, 1969.
J. Mack Swigert, Cincinnati, Ohio <William K. Engeman, Cincinnati, Ohio, ■on the brief), for petitioner. William C. Brafford, Dayton, Ohio, of counsel.
Elliott Moore, N. L. R. B., Washington, D. C. (Arnold Ordman, Gen. Counsel, Dominick L. Manoli, Associate Gen. Counsel, Marcel Mallet-Prevost, Asst. Gen. Counsel, Elliott Moore, Laurence Silberman, Attys., N. L. R. B., Washington, D. C., on the brief), for respondent.
Before WEICK, Chief Judge, and O’SULLIVAN and PHILLIPS, Circuit Judges.
ORDER
PER CURIAM.
The case is before the Court upon the petition of National Cash Register Company to review and set aside an order of the National Labor Relations Board. The Board has filed a cross petition for enforcement. The decision and order of the Board are reported at 167 N.L.R.B. No. 158.
Upon consideration, the Court finds that the decision and order of the Board are not supported by substantial evidence on the record considered as a whole. Universal Camera Corp. v. N. L. R. B., 340 U.S. 474, 71 S.Ct. 456, 95 L.Ed. 456.
It is ordered that the petition to review and set aside the order of the Board be and hereby is granted and that enforcement of the order be and hereby is denied.
Entered by order of the Court.

Question: What federal agency's decision was reviewed by the court of appeals?

Choices:
Benefits Review Board
Civil Aeronautics Board
Civil Service Commission
Federal Communications Commission
Federal Energy Regulatory Commission
Federal Power Commission
Federal Maritime Commission
Federal Trade Commission
Interstate Commerce Commission
National Labor Relations Board
Atomic Energy Commission
Nuclear Regulatory Commission
Securities & Exchange Commission
Other federal agency
Not ascertained or not applicable

Answer: 9