A stereoscopic viewer system receives a synchronization signal input from a left-right stereoscopic image pair production system. A viewer system has a transmitter and a modulator associated therewith to transmit into a medium a carrier signal modulated with the synchronization signal. A ...http://www.google.com.au/patents/US4424529?utm_source=gb-gplus-sharePatent US4424529 - Remotely triggered portable stereoscopic viewer system
