Those bits are struts, used to brace and lock the standards in position. There's no other camera that looks like that model Tachihara except the ebonised one with the Nickel Chrome finish.ions double extension that means the maximum bellows extension is double the standard FL lens for the format, with 5x4 that's 12"/300mm, triple extension is 18"/450mm.
The rear positioning of the standard is a compromise used on some British cameras, better models have front and rear focussing
I'm regularly identifying (or trying) to identify British field cameras and you get a feel of what to look for. Even well known manufacturers allowed cameras to be badged by the retailer so would sometimes not have their own name on a camera. Essentially hardware tends to be regional or even quite local so in London 5 companies use the same fittings and make near identical cameras. In the US Rochester cameras use some common hardware.
Ian