A Diode Blast from the Past

[fgentges at mindspring.com]

Phil,

I was similarly curious.  I looked and found 11-47 at the bottom of the 
first document.  Nothing for the second document but then 10-46 for the 
third.

This would indicate November 1947 and October 1946.  These are pretty 
early documents.  I like the amateur radio one with circuits including 
the SWR bridge for open wire line.

Frank K0BRA

On 4/22/2017 1:13 PM, Phil via Tacos wrote:
> What irritates me is that documents of the early 20th Century never ever seemed to bear a publication date. Even many books do not. On the plus side, I now know the difference between a 1N34 and a 1N34A. Nice find.
>
> Phil M1GWZ
>
>
>> On 22 Apr 2017, at 17:40, Richard O'Neill <richardoneill at earthlink.net> wrote:
>>
>> http://www.vintageradio.com/history/SylvaniaDiodes.pdf
>>
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