P.R.Products; 29 Newgate Street, London.
Small company producing a range of tubes including screened-grid tubes in 1929.
Employed a deposited metallic film on the glass to produce a golden effect claiming enhanced performance.
P.R.Products; 29 Newgate Street, London.
Small company producing a range of tubes including screened-grid tubes in 1929.
Employed a deposited metallic film on the glass to produce a golden effect claiming enhanced performance.