A toy rocket set that includes a rocket and a launcher for the rocket that utilizes compressed air to launch the rocket. The upper end of the launch tube has an end cap secured thereupon by a threaded connection. An annular elastomeric element is retained between the end cap and the launch tube body....http://www.google.fr/patents/US6532948?utm_source=gb-gplus-shareBrevet US6532948 - Toy rocket set
