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=== Sources ===
* [https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=FR&NR=394779A&KC=A&FT=D&ND=&date=19090201&DB=&locale= Original via Espacenet of French patent making reference hereto]
* [https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=GB&NR=190820822A&FT=D Original via Espacenet of British patent making reference hereto]
* Inventor location: Germany (See more on [[Heinrich Bauer]]. Though Espacenet seems to lack his German filings, we are gathering more on his changing of national residences and on his highly international array of patent filings.
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