Cossor were a large company and had diversified into other area most famously Radar. 

Cossor Radar was incorporated into Raytheon in 1961

They covered a wide spectrum of products industrial and Military as well as the domestic Equipment. 

I am going to cover some of Cossors other products on this page.

Cossor instruments Test equipment

Cossor produced test equipment for both service personel and developers alike they were very early into the market with an oscilloscope 

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I Sig Gen 

I Scope