I began to knit in the heyday of machine knitting, when local, national, and international seminars were held with accompanying marketplaces that made imported magazines and tools available directly from factories in Japan and Europe. As a result, I accumulated a huge stash of tools, including those for the Passap models, which also included duplicates of the Japanese tools with 5mm spacings.
I no longer own my Passap equipment.
My present shares address 4.5 and 9mm tools. Of those pictured below,
most were easily and commonly found, except for the accessory at the upper right and the gadget that accompanied the one on the bottom right (which I do not own). 
A few more:
Some have been frequently used, others were handy in demos, and a few have been waiting to meet machines or knits.
My remaining stash of 9mm tools is not pictured; that said, several pairs of now hard-to-find tools marked MT Stitch Tender are among them. 
Both German and Japanese manufacturers, at one point, provided an accessory to help in manual needle selection in patterns. Some were called Jac-40s, and the Brother model immediately became rare.
Adding to the confusion in terms of branding is that Knittax and the all-metal German-made KnitKing were closely related, effectively the same product marketed under different names in different regions during the 1950s and 1960s. Knittax was a 5mm machine.
The KnitKing name later became associated with Japanese plastic and metal Brother machines.
Some knitting machine history may be found in Daisyknits Brother compatibility charts and history, and Knitting machine history and information, Silver Reed +.
Information on the Passap Jac-40 and how to use it can be downloaded for free in two versions:
https://mkmanuals.com/downloadable/download/sample/sample_id/1001/
https://mkmanuals.com/downloadable/download/sample/sample_id/1002/
The Brother Jac is described as having been blue, 
while the Passaps were supplied in more than one color, sometimes marked with made in Germany. 
Early studio 9 mm metal beds came with no card reader or pattern selector.
My first machine was one, a Singer SK 150 metal bed. The PS 150 became available, a 12-stitch pattern selector that used punch cards as well, a collection of such card designs.
An excerpt from the PS manual: 
The first few pages of how to use the 9mm version pictured at the top right of the first photo begin to explain its potential use for manually selecting and knitting patterns, sometimes with changes required every single row.
Added images in More on Brother DBJ, including KR 260 bulky KM options.
As built-in card readers were added to machines, adjustable tools were modified, with some are still available to aid in hand selection of needles or pushers, ie, the Passap 30 count model for 5mm machines, 
and now, with the advent of 3D printing, a version for the file for a 4.5 mm version with 36 slots: https://www.thingiverse.com/thing:5252410
that with placing pegs in every other slots can serve on 9mm bulkies. They can be a boon in repetitive needle selections on either bed when automatic pattern selection is not available or possible.
I do not own a 3D printer. I have been able to acquire the adjustable selector and a stitch ditcher-slider for use on my 4.5mm Brother machines, info on its use to follow in a separate blog post. 