The present invention intends to propose an image pickup apparatus in which a plurality of camera head units can be easily installed at places close to each other. This image pickup apparatus includes a television camera system 10, in which video result of an external device 12 can also be transmitted...http://www.google.com.au/patents/US6118473?utm_source=gb-gplus-sharePatent US6118473 - Camera system for receiving and selectively transmitting images from another camera connected by a cable
