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File:Ludwig Ghostphone.zip #REDIRECT [[File:Ghostphone Ludwig Völker.zip]](4.34 MB) - 15:46, 31 March 2012File:Ghostphone Ludwig Völker.zip (4.34 MB) - 15:46, 31 March 2012
File:Ludwig-Berger-Portrait--008kleinswquadr.jpg (640 × 640 (56 KB)) - 16:28, 15 April 2013File:MakingConnection(Brendan-Cornelius-Ludwig).mp3 (3.52 MB) - 07:37, 22 April 2013
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File:Recording carotid pulse 1906.jpeg Taken from: Castagna, Ludwig. 1906. Spezial-Prospekt Physiologisch-graphischer Apparate. (p. 0009, fig. Castagna, Ludwig. 1906. Spezial-Prospekt Physiologisch-graphischer Apparate. (p. 0009, fig.(539 × 398 (57 KB)) - 18:51, 9 October 2016
