[Accueil]

Rechnerlexikon

Die große Enzyklopädie des mechanischen Rechnens

34.238.190.122 | Identification | Aide

  DE  EN  FR  IT 
Accueil
Toutes les pages
Modifications récentes

Version imprimable
Page de discussion

Article
Image
Brevet



Pages spéciales
Pfeil.gif Brevets  Pfeil.gif Ètats-Unis  

Patent:US3147556


Brevet:US 3147556
Titre:Calculating Device
Date:08.09.1964
Lieu:
Pays:Ètats-Unis
Personne:Prusmack, Murray (P)
Entreprise:
Liens internes:Rechenschieber, ABA-Ten Rule, Lehrmittel
Mots-Clefs:slide rule
Lien à la bureau des brevets:
(sans garantie)
 US3147556 (espacenet),  US3147556 (uspto)


"This invention relates to teaching aids and more particularly to a new and useful calculating device for introducing children of the kindergarten and lower grammar school grades to basic concepts in various branches of mathematics.

It is a primary object of present coordinates the sense of touch with the sense of sight to physically present and demonstrate a variety of basic number groupings in the arts of addition, subtraction, multiplication, and division and the number facts of these groupings in a manner which assists the young student in correlating abstract numerical symbols with corresponding physical entities." Aus der Patentschrift.

aus der Patentschrift