Sciencitific popularization exhibit of accurate ball throwing

A scientific popularization exhibit of accurate ball throwing is characterized in a sloping rail with a higher and end and a lower end. A throwing ball which can roll in the rail provided. A turnplate is arranged to the lower front side of the lower end of the rail. A ball receiving basket is arrang...

Ausführliche Beschreibung

Bibliographische Detailangaben

1. Verfasser:	GUANGYA,BAI YAN
Format:	Patent
Sprache:	eng
Schlagworte:	ADVERTISING APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND,DEAF OR MUTE CRYPTOGRAPHY DIAGRAMS DISPLAY EDUCATION EDUCATIONAL OR DEMONSTRATION APPLIANCES GLOBES PHYSICS PLANETARIA SEALS
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