My PM-833TV came with an OEM manual that has a check written beside the GEM-450BV model
(The OEM manual also lists other products: GEM-400G or GD or GS or GCT; GEM-450G or BV; GEM-500GII or GIII).
The GEM-400 appears to be made by a Taiwanese company call ARICAS.
Unfortunately ARICAS appears to have lost it’s domain name, so the Google links come up as “server not responding” or “this URL is available for purchase”.
Using the Way Back Machine (Internet Archive) I was able to view a webpage for the GEM-450G, which has the right description (No images)
This is an image of the ARICAS GEM-450G from before they lost their domain name:
Which appears to match the exploded view from both the OEM manual provided with the mill and PM’s manual.
So… my conclusion is that the PM-833TV is the ARICAS GEM-450BV
ARICAS MACHINERY CO., LTD. ALL RIGHTS RESERVED.
No. 17, Ln. 301, Fengzhou Rd., Shengang Dist., Taichung City 429, Taiwan (R.O.C.)
Tel:+886-4-25154766 Fax:+886-4-25154793
(It’s a pretty tenuous internet trail)