Four German DRGM and DRP, From left:
1)DRGM #1308,467, May 28, 1934. See Peters mechanical book., p. 103.
2) Kampf's July22, 1928, DRGM #958,928. See Peters, p. 108
3) Becker's Dec. 23,1909 DRGM # 504,690."MONOPOL",See Peters p. 103
4) Becker's March 7, 1893 DRP (patent), "COLUMBUS", See Peters, p. 96
All marked as indicated in image.
See images.
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