118542
It was built by chemist Robert Davidson of Aberdeen in Scotland , and it was powered by galvanic cells ( batteries ) .
 Robert Davidson, Aberdeen, Scotland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Robert Davidson, Aberdeen, Scotland