Educational balance beam

Details Educational balance beam Educational balance beam

1987-07-27

1990-06-19

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

272111

Patent

active

D03086984

REFERENCES:
patent: 3545747 (1970-12-01), Thomas
patent: 3580568 (1971-05-01), Stone
patent: 3837644 (1974-09-01), Stinchcomb
patent: 4105201 (1978-08-01), L'Eaujer et al.

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