The third corner of the "revolution triangle" if you will was Lowrance Electronics. Carl Lowrance created a small, transistorized depthfinder and began marketing it at about the same time as Buck coming to Chicago (1957). Known as the "Red Box," Carl tried to put these units in the hands of as many well recognized anglers as he could. Al and Ron Lindner were a couple of the first to have such a unit, along with Babe Winkelman. These red units were followed closely by the "Green Box," which started to appear at local department stores. Bill Binkelman said he had 3 of them, always wanting to make sure one was up and running.
Looking at some of the original ads in this post, you'll notice a couple interesting things. One, the company started out as Lowrance Sales Co., and then switched around 1958 to Lowrance Electronics Mfg. Corp. (LEMCO). Notice the naming progression in the ads, which appeared first in Popular Mechanics magazine, and later in Fishing News. The other thing to notice is that they were located in Joplin, Missouri, this location being the predecessor to their more well-known Oklahoma address.
One final comment. The price tag on the initial models was $148.50. If you adjust for inflation, that is equivalent to $1,240.56 in 2016 dollars - making the units a very spendy proposition for their time. Subsequently, not a lot of anglers had easy availability to such units at the time due to these cost restraints. Large department stores had to offer monthly financing in order to allow customers to purchase the units.