What did George De Mestral invent besides Velcro?

Besides Velcro, George de Mestral also invented a device for automatic timing of the opening and closing of the luggage compartments on airplanes. His work primarily focused on the principles of adhesion and fastening, leading to innovations in various fields, but Velcro remains his most notable invention. De Mestral's insights into the natural world, particularly the burrs that inspired Velcro, also contributed to advancements in other fastening technologies.