Bleeder with KOLB case, but marked ED or FD on back?

Wraith_3

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Joined
Mar 24, 2021
This is another item from my dad's collection. It's a spring loaded bleeder and it has a case that says "KOLB" on it, but unlike others from that make it is marked "ED" or "FD" on back. I know nothing about these, except what they were used for, so I'm guessing maybe it's another make with a KOLB case? Does anyone know?

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ucvrelics

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Regtl. Quartermaster Shiloh 2020
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Interesting piece, lets see if our Medical expert has the answer to your question. Paging @lelliott19
 

Wraith_3

Private
Joined
Mar 24, 2021
I found some others that were the same so I assume the marking on the back might be where it was made or something and KOLB is the maker. It's on ebay now.
 
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