![[Photo: Photo of Pneumatic Clock]](4217_peoples_gas_photo_of_pneumatic_clock.jpg "Photo of Pneumatic Clock")
"In an effort to efficiently provide accurate time service throughout the building, a pneumatic clock system was installed from which one master clock could operate, control, and synchronize any number of auxilliary clocks. The clocks were designed and produced in Chicago by the Hahl Automatic Clock Company."
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