Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 5769639 | Multi-educational device A self-corrective, reversible device comprising a handled, slotted framework, on each side of which the top frame is imprinted with inverse mathematical symbols, below which is a number line from one through ten in ascending and descending order. Below th... | 06/23/1998 |
| 5725380 | Combination writing board and abacus A portable and foldable teaching aid combines an abacus and an inclined writing surface. The abacus helps teach math skills and the inclined writing surface helps strengthen hand and wrist muscles that are used in writing. The abacus and writing board are... | 03/10/1998 |
| 4772208 | Apparatus for use in teaching mathematics An apparatus for teaching mathematics which applies and puts to work in various ways the modern teaching of mathematics for all levels of elementary education through set theory, comprises a horizontal board divided into eleven zones and having two outwar... | 09/20/1988 |
| 4763291 | Remote display device for a microcomputer An optically linked calculator system for displaying data generated by a local calculator at both the local calculator and at a detached display. The calculator system includes a plurality of transmitting calculators and receiving units. The receiving uni... | 08/09/1988 |
| 4313727 | Educational frame device having a rotatable body and rotatable symbol-bearing inserts A board-type device for use in teaching children the alphabet, numbes, how to tell time, and the like. The device includes a disk-like, double sided chalkboard member and a ring-like frame member extending completely about the periphery of the blackboard ... | 02/02/1982 |
