thereto the value of the machinery in question, fixed at $618,000. This included property acquired from other tool manufacturers as above described, $444,000; that manufactured by Mesta, $14,000; lathes brought from the Watervliet Arsenal, $160,000. Mesta protested and exhausted administrative remedies without avail, and on July 30, 1942, paid under protest $6,137.12, the amount of the tax attributable to this increased assessment.
Mesta took a timely appeal allowed by statute to the Court of Common Pleas. The United States petitioned to intervene, reciting that it would be required to reimburse Mesta by force of its contract. Intervention was permitted against objection by the County, and the United States has participated in the litigation since. Mesta attacked the assessment under both state and federal law, claiming that under the State Tax Law property belonging to another was not to be considered a part of its mill and that if construed to authorize assessment and taxation of this machinery, the statute violated the Federal Constitution.
The Court of Common Pleas held that the State Act authorized the assessment, but that the machinery here involved was “owned by the United States” and so for constitutional reasons could not be included.
The Supreme Court of Pennsylvania, on appeal of the County, reversed, and reinstated the assessment. It held that under the state law regardless of who held the title to it the machinery constituted a part of the mill for purposes of assessment and was properly assessed as real estate. It acknowledged that property held by the United States is “beyond the pale of taxation” by a state, but this assessment, it said, is not against the United States but against Mesta, which is operating its mill for private purposes. If Mesta defaulted in tax payments, the Court held that “the paramount rights of the Government in the