[Phono-L] Question about a Columbia Graphophone model I have never seen or heard of....

[Ken aka: OnATorrent]

Hello all,
 
Can any one give me some insight into the Columbia Disc Graphophone BWT?  I 
have not been able to find any info on this model and if it is a correct model 
to even beging with.  I know that Columbia parted some machines together but 
this I have never heard of before.
 
Any help would be most welcomed,
Kenneth Keeton
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