Brother KH561 knitting machine was manufactured and released to the market in the mid-1960s. It is a metal flat-bed knitting machine with patterning capabilities: the needles can be selected automatically by an 8-push button mechanism.
I have not had a chance yet to work with this machine or to even own one or see one in real life.
The pictures below are provided by other enthusiasts and posted in this blog with their permission.
Other Brother standard-gauge 8-push button knitting machines are KH552, KH560, KH581, Profile 583, Profile 585, KH587, KH588, and Genie KH710. They all work very similarly and you can refer to the corresponding articles. If you like this type of patterning mechanics but would like versatility, check out the Brother KH800 knitting machine: it has the same ratchet-based needle selection mechanism but it is actually punch-card based (thus, more unique needle combinations with 12-stitch repeat).
Unlike other 8-push-button sisters, this machine comes with nice cream/pink colors and definitely stands out from the crowd!!