They are all subsidiaries of the mother company RayTron.
RayTron got numerous segment-specific subsidiaries.
RayTron (tech Limited) is a leading manufacturer of uncooled IRFPA - and delivers products to various fields, night vision, thermal temperature measurement, intelligent surveillance, UAV load, automatic driving, IoT, AI, machine vision, and a shutload of other things.
They had around +2000 employees last time I did my due diligence on "Raytron Technology limited" though its a few years back..