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wave solder · 22nd Apr 2021, 5:24 pm

I have six glass masks here which would have been used for IC manufacture, they are Marked STC LTD 1982

The six masks are labelled:-

51A STL-134A ISOL
91A STL-134A METAL 2
61A STL-134A METAL 1
811A STL-134A POLY.
121A STL-134A PASS.
41A STL-134A OHMIC

It would be interesting to know what the device was what was manufactured using them.

22nd Apr 2021, 5:24 pm	#1
wave solder Hexode Join Date: Feb 2007 Location: Chesterfield, Derbyshire, UK. Posts: 483	Telecomms IC I have six glass masks here which would have been used for IC manufacture, they are Marked STC LTD 1982 The six masks are labelled:- 51A STL-134A ISOL 91A STL-134A METAL 2 61A STL-134A METAL 1 811A STL-134A POLY. 121A STL-134A PASS. 41A STL-134A OHMIC It would be interesting to know what the device was what was manufactured using them.