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My 35 (not 35s) story.



#2

Hi everybody...
I was at a family reunion about a month ago. My cousin, who is a retired Air Force colonel, upon finding out that I collected HP calculators, asked me if I had an HP35, to which I answered no. He then asked me if I wanted one, to which I answered YES. As a young AF Acadamy cadet in the early 70's, he had purchased a brand new HP35 at the cadet bookstore, and had managed to hang on to it for all these years, and was now willing to give it to me. Good fortune had smiled on me.

The calculator arrived a couple weeks ago, and aside from being quite dirty (food all over the keyboard), it also suffered from intermittent operation. Complete disassembly, and scrubbing the case halves in hot soapy water cleaned it up beautifully. Carefully spreading the fingers (for better contact) of the keyboard array contacts resolved the intermittent operation issue, and it now works perfectly. The one sour note is that the corners of the back label (which was perfect) are now creased from being pulled back to access the screws. If anybody has a source for these labels, I would be very interested.

Lastly, a question If I could. What's the purpose of the metal plates in the lower case half? They seem to contact, by design,
a couple of the finger connectors at the bottom edge of the calculator. Is this some sort of RF shielding?...Or perhaps some sort of capacitive device? I would be most curious if anybody knows.

Thanks, and best regrds, Hal


#3

Hi Hal.

Congrats to you and to your generous cousin! (I guess many of us would like to have different relatives... ;-).

Did you check if *by chance* there's also a tiny red dot by the swicth's side ? :-)

I'm really happy for your new HP collectible!

Best regards.

Giancarlo


#4

Thanks Giancarlo,

It's not a red dot model. I think it's probably a later model, as the 35 appears on the lower edge placard, and it does not have the
2.02 ln-e^x bug. the SN is 1302A95884.

Best regards, Hal


#5

Talking about the HP 35, I have, what I think, a third version unit, sn 1302A 81058. The sticker in the back still shows a PATENT PENDING legend. I saw photos of other units without this legend. I wonder when this message has been removed?

Regards,

Miguel


#6

Quote:
Talking about the HP 35, I have, what I think, a third version unit, sn 1302A 81058. The sticker in the back still shows a PATENT PENDING legend. I saw photos of other units without this legend. I wonder when this message has been removed?

I have two HP-35's: sn 1302A 30261 and sn 1346A 22104. Both have the PATENT PENDING legend.


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