I stumbled across an early reference for Thor. They were in the Washington fair in 1905, The company name is in fact The Aurora Automatic Machinery Co.
They were showing mostly air powered tools at the time
""Thor" pneumatic tools. These embraced drills, reversible and non-reversible, of capacities ranging from a 2 1/2.-inch drill down to watchmaker's sizes. Air machines for reaming and tapping and wood boring were seen in a large number of sizes, also a full line of hammer for riveting, caulking and chipping, all of which were in operation. One of the novelties of the "Thor" tools was an air turbine driving a portable cut-off saw, ..."
