Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HENRI FERREOL
Original Assignee
HENRI FERREOL
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by HENRI FERREOLfiledCriticalHENRI FERREOL
Application grantedgrantedCritical
Publication of FR428816ApublicationCriticalpatent/FR428816A/fr
G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
G09B19/00—Teaching not covered by other main groups of this subclass
G09B19/02—Counting; Calculating
Landscapes
Business, Economics & Management
(AREA)
Engineering & Computer Science
(AREA)
Entrepreneurship & Innovation
(AREA)
Physics & Mathematics
(AREA)
Educational Administration
(AREA)
Educational Technology
(AREA)
General Physics & Mathematics
(AREA)
Theoretical Computer Science
(AREA)
FR428816D1911-04-221911-04-22Boite à calculer pour l'enseignement de l'arithmétique
ExpiredFR428816A
(fr)