ABRUZZO, District Judge.
This is a suit for infringement of the Pacz patent No. 1,410,499, filed February 20, 1917, and issued March 21, 1922.
The patent contains claims covering a process and a product. However, only product claims 25, 26, and 27 are here in suit.
These three claims cover an incandescent lamp filament and read as follows:
"25. A filament for electric incandescent lamps or other devices, composed substantially of tungsten and...
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