File:Top view and cross section of a hole with coquilles, Otto's Encyclopedia.jpg

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Description
English: Top view and cross section of a hole with coquilles, as pictured in Otto's Encyclopedia (Ottův slovník naučný, 1908)
Čeština: Půdorys a řez jámou s kokilami, vyobrazené v Ottově slovníku naučném (1908).
Date
Source "Železářství." Ottův Slovník Naučný. Vol. 27. Praha: J. Otto, 1908. 775–787. Print
Author Unknown authorUnknown author. The author of the image is not given in the book, although it might be the author of the text entry Josef Pokorný.

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Public domain
This work was published before January 1, 1929 and it is anonymous or pseudonymous due to unknown authorship. It is in the public domain in the United States as well as countries and areas where the copyright terms of anonymous or pseudonymous works are 95 years or fewer since publication.

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