The Bohm “Triller” harmoncia must have been manufactured around 1898.
That is the year the patent #100650 was granted.
The “Triller” is not a chromatic harmonica per se but the slider mechanism is
similar to the one used in early chromatic harmonicas.
A similar slider was used for the Hohner “Up To Date” which came out the same year.
The slide used for the “Triller” just creates some trill sound effects.
The principle idea of the slider and sound effect is similar to the one used for the “Meine Mandoline” harmonica (scroll to the bottom of the page), also manufactured by Bohm.