I have two GT 15 Gas Turbines from Adolph Saurer. Both are equipped with pull starters. My question is, does any one know any thing about these turbine engines, serial no.s 014 and 026?

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Wow your turbines are collectables. I would hold on to them as they are investments. What info are you looking for specifically?
here is the info on your turbines:
Probably one of the most unique gas turbines in the world the Saurer GT15. The GT15 was the worlds smallest production gas turbine in the mid 1960s, it is virtualy the size of many model engines which we know today. For many years it was suggested that very small engines were impossible to produce, this engine disproves this.
Adolf Saurer LTD of Arbon in Switzerland was a large heavey engineering company producing trucks, railway locomotives and deisel engines. The GT15 gas turbine was sold for use as a small APU and also for portable generating equipment.Only 22 units were delivered for use as the APU on the Hansa HFB320 biz jet.

The GT15 is a very inervative power plant, the fuel supply was also used as a lubricant, this engine contains no oil. Certain versions of this engine also had one entirely unique feature- it was started by a pull cord! A spring loaded cable retracts into the gearbox and when required is pulled vigorously in and out to start the engine. Considerable effort was required to reach self sustaining speed, a dislocated shoulder often resulted!
Saurer still exist today but they produce textile manufacturing machinery, all traces of gas turbine work have sadly gone.