Transcriptors Ireland gave license to Michell Engineering to manufacture the Hydraulic Reference... But the the ones made by Transcriptors in the mid to late 60's are the ones that are more sought after (popularized in the Kubrick flick,
A Clockwork Orange.) Their latter Vestigial Arm is only usable with the then trendy ultra-light tracking cartridges. The original 10" arm that comes with the Reference/Hydraulic Reference is much more suited to a wider variety of cartidges (heavier low compliance.)
This particular model (Transcriber) has the linear trackingl arm mounted under the lid
While the platter itself moves across the stationary arm for record tracking (talk about reverse engineering
)
Transcriptors is actually still around and released a new "budget" model, the
T6:
http://www.transcriptors.co.uk/