A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Underground loud speakers; illustrated description of German type of 990-mm diam, built into ground to serve open air audiences for various purposes.
Underground loud speakers; illustrated description of German type of 990-mm diam, built into ground to serve open air audiences for various purposes.
Underground loud speakers
Bodenlautsprecher
Duvigneau, G. (author)
VDI Zeitschrift ; 82
1938
2 pages
Article (Journal)
German
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| Engineering Index Backfile | 1938
Engineering Index Backfile | 1926
| Engineering Index Backfile | 1930
Engineering Index Backfile | 1925
| Engineering Index Backfile | 1937