Hewlett-Packard, HP-21 Scientific Pocket Calculator.
| Item# |
sci200 |
| Status |
SOLD |
| Price |
SOLD |
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Hewlett-Packard, HP-21 Scientific Calculator. This HP-21 was the second generation of handheld calculators and the first of the 20 series introduced in 1975. It was essentially a smaller version of the... [more info]
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BRUNSVIGA MIDGET BY GRIMME, NATALIS & Co.
| Item# |
sci206 |
| Status |
SOLD |
| Price |
SOLD |
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BRUNSVIGA MIDGET BY GRIMME, NATALIS & Co. German, 1st quarter 20th century, stamped on top 'BRUNSVIGA MIDGET' and painted in gold 'GRIMME, NATALIS & Co.' This small pin-wheel type calculator stands 5 inch... [more info]
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Westec Electrical Engineer's Slide-Rule.
| Item# |
sci207 |
| Status |
SOLD |
| Price |
SOLD |
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Westec Electronics Slide Rule. This double sided slide-rule was custom made for an electrical engineer. Includes reactance problems, resonance problems, Ohm's law, temprature transformer and more. Made... [more info]
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18th Century Brass Sector and Diagonal Scale.
| Item# |
sci211 |
| Status |
SOLD |
| Price |
SOLD |
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An exceptional and rare set of Brass Sector and Diagonal Scale. 18th Century Made by Heath & Wing, London. The sector is engraved with scales of mathematical functions (to give similar information to that... [more info]
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