I just bought this
circa 1950’s bakelite Hohner Echophone harmonica with echo chamber.
It has a diatonic Harmonica key of C .
It looks cool but like other harmonica attachments, they not only do not enhance the sound but they restrict your ability to use hand effects.
Here is a demo
The grandpa version of the suzuki’s humming pipe 
WOW! 
How does that baby play?
And I thought these were over the top! 
Both up for auction on eBay at the moment.
Per your request Luke
HOLY trumpet call, Batman!!
Enjoyable little jam in any case!
Thank you
It seems to me that hohner stopped innovation some decades ago and just wants to stay mainstream with the current product offering. Mnmnmnn…
The Rocket has innovation with slightly bigger tapered conical shaped comb chambers.
Neat - thx for sharing.
That looks like fun!
It looks like fun but your hands works so much better.
