The numbers are G141 7728, G142 9206, G111 4214 and G135 8248. They are Analog Devices and the prefix is ADG. They are most likely ADG14X, ADG111X and ADG135X Series switches. The four digit number is the date code.
I sure do appreciate any help as no one including has been able to locate the datasheet for them.
Very interesting, BUT, I failed to list for everyones information that they are eight pin soic packages and they are in Analog Devices tubes. I believe that they are in the same family as those you list but maybe with just one channel rather than two channel. Would this make sense to you?
Thanks for the information....maybe we are getting closer.