I went through the research letter archives, reviewed the order books for these guns, and looked at TPS. Here is what I've found.
1. We have research letters for 4 of the guns so we know how many are known. They are 159076, 159077, 159093, and 163962.
2. TPS has a mistake in the table. 159092 has the name of L.J Foris, the correct name is L.J. Foin.
3. A research letter was written in 2011 and the name of the guy ordering the gun was misspelled. It was written as H.T. Willis when it should be H.T. Miller. I'll contact the research letter requester and see if he want's a corrected copy.
Sorry, I can't give you the names of those individuals that ordered the research letters.
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