[PSUBS-MAILIST] Helle Engineering frequencies or any other info

[Brian Hughes via Personal_Submersibles]

Found an obituary of the fellow who founded Helle Engineering.  My kind of guy, not formally trained as an engineer, but a curious mind and independent research led him to found a successful company building underwater com systems.

I can't find anything on the web about the blue boxes his company sold, especially the frequencies they used for through water systems. Anyone here remember them or where to find more info?

Thanks,

Brian

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