On Fri, 9 Jan 2009 15:58:28 -0000, "N_Cook" put
finger to keyboard and composed:

Firstly are they synomynous?
I have a data book , printed in 1933
Westinghouse "the all-metal way" metal rectifiers ,

Search for US patents containing the terms "metal rectifier" and which
are assigned to Westinghouse:
http://www.google.com/patents?as_q=&...maxy_ap=20 09
http://preview.tinyurl.com/9aqglu

For example, US patent 2,802,158 (Aug 6, 1957) refers to "metal
rectifier elements which may be selenium rectifiers":
http://www.google.com/patents/pdf/ME...xvHOk3IZmdgL0g
http://preview.tinyurl.com/9qtwc4

This suggests that selenium rectifiers were just one type of metal
rectifier.

Other patents refer more generally to "metal-oxide rectifiers":
http://www.google.com/patents/pdf/ME...eyz3OVvVUaJjTg
http://preview.tinyurl.com/8yphxt

- Franc Zabkar
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