Hello, Captain Steve.
Slide tremolo chromatic harmonicas have
a history, but only one company (Suzuki)
produces them today.
www.suzukiharmonicas.com (closed for new website development)
www.suzuki-music.co.jp/Suzuki's Headquarters is in Hamamatsu,
Japan, founded in 1953 by school music
teacher Manji "Man-chan" Suzuki (1929-?).
Man-chan started making harmonicas in a
rented farmhouse room in Sumiyoshi Town,
Japan, later moving to Hamamatsu in 1953.
The Suzuki SCT-128, today's slide chromatic
tremolo is, in my opinion, far superior to the
slide tremolos made in the past.
A FREE, SCT-128 maintenance instructions
sheet is downloadable. Go to the 2nd website
address listed above, and select chromatic
harmonicas, then SCT-128 (SPT-128).
The SCT-128 is a 4-octave, 128 reeds slide
tremolo chromatic. It is a solo system harp,
like the standard 4-octave single reed slide
chromatics of today.
The first known, mass-produced tremolo slide
chromatic was made and USA patented in 1941,
(#2256682) by the Torahachi Machino harmonica
company of Tokyo, Japan. The patent is for a
knob-turned tremolo chromatic harmonica.
The Machino's toothpaste-cap-shaped turning knob
is located on the right side of the bakelite-combed
harmonica. Turning the knob moves a tube from
a key of C set of reeds to a C# key set of reeds
on another reed plate. It has 22 reed chambers,
each chamber with 2 tremolo reeds.
Best Regards, Stay Healthy
JB