Lets see if I can answer a few of those questions....
This pump was patented in 1918. Its sometimes referred to as a "Previsible". Also called "curb" pumps, because they were out at the curb, these were made before the tall, upright pumps with the glass cylinders. Some of these were later fitted with cylinder attachments. (sp?) The gas from these older pumps, was usually pumped into a gas can, carried on the running board. From there, the gas was poured into a funnel, through a cloth or chamois, to filter the gas. As far as branding, I believe that it was Texaco that started that in 1912. Prior to that, the pumps might have had a globe with the word "Gasolene"..... thats how it was spelled back then. It was Standard Oil of California (Chevron) that built the first service staion, Gulf Oil has also claimed that, the station was set up in 1907. http://www.oldgas.com/shoptalk/ubb/Forum4/HTML/001159.html
Until cars became big business, gasoline, was typicly sold at the General Store.
I hope this answers a few of your questions.