Category Archives: control system

Dr. Stamen Grigorov

Dr. Stamen Grigorov special :  today google showing a doodle to celebrate 142th birthday of Dr Stamen Grigorov . he was the Bulgarian physician , it means from Bulgaria , he born in Studen Izvor city of Bulgaria on 27 October 1878 , in the age of 67 he died in sofia city Bulgaria …. Continue reading »