1903 Patent No. 25,964 hollow artificial stones, Ernest Petzholtz, Potsdam

Patent No. 25,964 A.D.1903 "Improvements in and relating to Hollow Artificial Stones for Building Purposes"

"I, Ernest Petzholtz, Master Builder, of Alte Louisenstrasse No. 57, Potsdam, Kingdom of Prussia, Germany, do hereby declare the nature of this invention and in what manner the same is to be performed, to be particularly described and ascertained in and by the following statement: My invention relates to a new method of manufacturing hollow building and vaulting stones of any desired size and cross-section..."

2 pages of text + 1 drawing which have been disbound from a larger volume.

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