What follows is an opinion from a United States Court of Appeals.
Intervenors who participated as parties at the courts of appeals should be counted as either appellants or respondents when it can be determined whose position they supported. For example, if there were two plaintiffs who lost in district court, appealed, and were joined by four intervenors who also asked the court of appeals to reverse the district court, the number of appellants should be coded as six.
When coding the detailed nature of participants, use your personal knowledge about the participants, if you are completely confident of the accuracy of your knowledge, even if the specific information is not in the opinion. For example, if "IBM" is listed as the appellant it could be classified as "clearly national or international in scope" even if the opinion did not indicate the scope of the business. 

Your task concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". Your task is to determine what category of business best describes the area of activity of this litigant which is involved in this case.

Opinion:
FISCHER & PORTER CO. v. BROOKS ROTAMETER CO.
No. 11012.
United States Court of Appeals Third Circuit.
Argued Feb. 16, 1954.
Decided April 7, 1954.
Leonard L. Kalish, Philadelphia, Pa., for appellant.
Ralph L Chappell) New York City (J< Edward Shinn Philadelphia, Pa., on the for appellee.
Before MARIS, KALODNER and STALEY, Circuit Judges.
PER CURIAM.
This is an appeal by the plaintiff from a judgment for the defendant entered by the district court n. o. v. in an action for damages for infringement of plaintiff’s Fischer patent No. 2,441,350 for a rotameter and metering tube therefor. The case was tried to a jury to which three issues only were submitted, all other issues being reserved by stipulation of the parties for the court. The three issues submitted to the jury were whether the patent involved invention, whether Fischer was the first and original inventor and the amount of damages, in the event of a verdict for plaintiff. The jury rendered a verdict for plaintiff in the sum of $14,177.36.
Thereafter the district court, upon motion of the defendant, entered the judgment in its favor from which the present appeal was taken. The court did so pursuant to its conclusion that the evidence, taken in its most favorable light for the plaintiff, failed to support a finding of invention and that in any event the claims of the patent were invalid for want of definiteness. These conclusions are set forth in a comprehensive opinion filed by Chief Judge Kirkpatrick, 107 F.Supp. 1010. We find ourselves in complete accord with his reasoning and conclusions and need add nothing thereto. They fully support the judgment appealed from.
The plaintiff urges that the district court erred in denying its subsequent motion for reargument or a new trial, in support of which it offered 25 documents as additional evidence which it alleged contradicted certain of the defendant’s evidence. The judgment n. o. v. was entered because of the insufficiency of the plaintiff’s evidence, however. Moreover the documents did not in any event qualify as after discovered evidence. We find no error in the denial of the motion.
The judgment of the district court will be affirmed.

Question: This question concerns the first listed appellant. The nature of this litigant falls into the category "private business (including criminal enterprises)". What category of business best describes the area of activity of this litigant which is involved in this case?

Choices:
agriculture
mining
construction
manufacturing
transportation
trade
financial institution
utilities
other
unclear

Answer: 3