ES83211U - Apparatus for learning to count and fundamental arithmetic operations (Machine-translation by Google Translate, not legally binding)
- Google Patents
Apparatus for learning to count and fundamental arithmetic operations (Machine-translation by Google Translate, not legally binding)
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TUR COSTA MIGUEL
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TUR COSTA MIGUEL
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Apparatus for learning to count and fundamental arithmetic operations, essentially characterized by the fact of being constituted by a rectangular board in which are arranged several columns of ten and eight cards each, these columns being separated by edges of sufficient width to carry written the numbers in decreasing order of two consecutive series beginning with 8 and ending with 0 the first and 9 through 0 the second, marked with a color one series and with another different the other, to determine the unit limit of the column and the passage from one unit to the next column, these two series of numbers occupying the total length of the rim minus a small space, and each number occupying the space of a token. (Machine-translation by Google Translate, not legally binding)
ES83211U1960-09-241960-09-24
Apparatus for learning counting and fundamental arithmetic operations
ExpiredES83211Y
(en)
Improvements introduced in the manufacture of construction elements that include perforations (Machine-translation by Google Translate, not legally binding)