|Name and Model Number||Keuffel & Esser 4104 |
Mystery 2O Inch
|Country of Origin||USA|
|Date of Manufacture||1945|
|Front Scales||50cm / A [ B CI C ] D L | K|
|Back Scales||Slide: [ S A T ] ; NBS Circular No. 47 Conversion Table|
|Scale Length||20" (25 cm)|
|Type of Rule||Slide Rule|
|Construction||Celluloid on mahogany|
|Area of Use||Generic|
|Comment||Mystery rule with model number 4104 not appearing in any K&E catalog.
Scale set similar to N4053-5 except for location of L and K scale and
the inclusion of A scale on reverse.
Serial No. 118637.
|Donor||Collection of Dr. Paul J. Tarantolo Jr.|
(Click Picture for Details)
|In conjunction with our 'donors' we assign a rarity rating to each item, based on the system devised by Herman van Herwijnen|
|(1929 - 2004), renowned Dutch collector, author, and creator of Herman's Archive, a collection of 5,000 slide rule images on CD.|
|• RR = Rare - 1 of 25 collectors has one; it may take a year to find an example in the marketplace.|
|• RRR = Very Rare - only a few known to collectors; may be several years before it comes up for sale.|
|• RRRR = Extremely Rare - a museum piece; unlikely that an example will come up for sale.|