At one time NSS Pigs were advertised to movie theaters-that's was where the oldest surviving one was found.Now at the NSS headquarters behind glass-they can bring it out and show that the Pig still works after all of its life eating spilled popcorn and discarded candy wrappers!On the Film Tech forum site they show the ads for NSS vacuums in the cinema trade magazines along with ads for projectors,amps,speakers,carbons,screens,etc.