Cincinnati, OH: Cincinnati Milling Company

(Satellite, my guess based on the topo map below.)

VintageMachinery
"Frederick A. Geier died in 1934, and although Geier's son, Frederick V. Geier, was felt by some to be too young, he took charge and ran the company for the next quarter century. The younger Geier had a college education, considerable experience as a machinist, and had served in the military during World War I when he fixed production problems with 75 mm cannon. During a trip to Germany in the early 1930s Geier realized that another war was inevitable and upon his return he aggressively expanded his company's production capabilities: by 1939 they were the largest in the US. He realized that the then-future Allies would not be able to machine the barrels of big naval guns, so he tooled up his factory to do just that. During the Second World War, all of the country's largest guns were machined by Cincinnati Milling Machine Co."

Penn Central was Pennsy and is now IORY. The B&O is also now IORY.

1974/75 Cincinnati East Quad @ 24,000

Practical Machinist posted
A picture from the Cincinnati Milling Machine factory. Here you can see a machinist has a casting for a dial-type vertical mill set up on a large HBM, ready to machine some of the cast surface. Source: lathes . co . uk

Richard Taylor: Poster has failed to mention this is from the British Cincinnati factory in Birmingham. Uk also had a Blanchard factory, kearney and trecker, gleason gear cutting machines and gidding and lewis factories.

Aug Blanchat: Machines making machines.

Old Photos Of Cincinnati posted three photos with the comment: "Cincinnati Milling Machine early 1940's."

Arnold Dykes: The machine capital on the world’ Cincinnati . [And several comments say that Cincinnati Milling was the world's largest machine tool manufacturer.]

Dustin Eng Mcdole: Those pics the Oakley plant or Batavia? [This taught me to look in Oakley Cincinnati for the plant. Batavia is the more modern stuff and now is plastic injection mold machines.]

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At one time the "Mill" was the world's largest Machine Tool Builder.

Some of their products.

Milling machines, Horizontal, vertical, tool toom and production models.

OD Grinding machines

Centerless Grinding Machines

Profile milling machines, The Hydrotel etc

Horizontal and Vertical Broaching Machines

Transfer Lines that took in raw castings at one end and a finished auto engine came out the other.

Grinding Wheels and Coolants

N/C Milling ...The Cintimatic Machining Centers and many versions of it.

N/C profiling mills big enough to park several tractor trailers on. Most of them 5 axis

The Cimtrol Div built the Acramatic controls.

Plastics Div made Injection molding Machines

[Gary E comment in PracticalMachinist]