Agi was made in England by Aeronautical And General Instrument Co. Ltd. unfortunately I'm old enough to remember .
Yes but I'm just a touch younger and used a 6x6 Agifold in the early 1990's with a built in extinction meter, it wasn't a bad camera - I made a mistake and had just moved house and stored it and a few other cameras in my dry cellar in the winter, in the summer things changed and it was very humid, the Agifold, an early Rolleicord and a few other cameras all suffered terminally from damp and corrosion, a lesson learnt.
AGI made aerial/mapping cameras into this millennium. I still use an AGI shutter with a 150mm G Claron but they aren;t up to scratch with a Compur, Prontor SVE or even Epsilon.
Ian