Abstract: In a GRGB line sequential color television system, the sequential-to-simultaneous decoder in the receiver employs separate delay line and switch arrangements for each channel. Also, the sound signals associated with the green (G) portions of the sequence are transmitted in multiplex form with the other sound signals during the R and B portions of the sequence.

Abstract: There is disclosed a self-contained underwater breathing arrangement including a cap or helmet for a skin diver having a hollow walled arrangement wherein air may be stored for rebreathing as needed. Additionally, there is disclosed, with and without such a combination a snorkel attachment for breathing purposes secured to such a cap having an elongated tube adapted and constructed to extend to the surface of a body of water. The tube terminating on a reel mounted on a floating structure whereby the tube may be wound thereon and unwound as desired.