Keywords: Meyers b3 s0151 b4.png de Bohrratsche oder -knarre a “ Zylinder b “ Sperrrad c “ Gabel d “ Bohrer e “ Sperrkegel f “ Spitze Meyers b3 s0151 jpg ca 1885 author PD-Meyers Drills Images from Meyers Konversationslexikon 4th edition - text figures |