| 1. Verfasser: | Doppelfeld, Otto 1907- 
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        | Ort/Verlag/Jahr: | Frankfurt (Main) :
                                      Verl. d. Dt. Glastechn. Ges.,
                        
                          1961. 
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      | Umfang/Format: | pages 563-566 : illustrations ; 30 cm. 
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          | Enthalten in: | Glastechnische Berichte ; 34.1961., 34.1961, 12 
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