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Conn, 25J, BB flat tuba, 4 piston, 1967 | V & E Simonetti Historic Tuba Collection
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%20C.%20G.%20Conn's%20Truth%20(vol.%209,%20no.%207)%20-%20Copy%20(3).jpg "Strictly Oompah: C. G. Conn Basses - A Complete List")
Strictly Oompah: C. G. Conn Basses - A Complete List
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C.G. Conn 20J BBb Bell Front Recording Tuba 1968 | Reverb
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Figure 5.1 from C.G. Conn Tuba Designs from 1880-1940: An Investigation of Early Tuba Product Lines and Construction Techniques | Semantic Scholar
Conn, 20J, BB flat tuba, 3 piston, 1946, catalog cut | V & E Simonetti Historic Tuba Collection
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Conn, 20J recording, BB flat tuba, 3 piston, 1946 | V & E Simonetti Historic Tuba Collection
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Conn 20J Front Valve Conversion?? - Page 2 - TubeNet
