What industry used this hunk of American iron oscillator?

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The tag on this says it was last calibrated by SEI in 1968. A product of Southwestern Industrial Electronics, Model M-2 R-C, Houston TX. (120v).
Had this tested once. He said it's measurement was about 90 cycles out of spec, but otherwise totally functional, even the red light for switch and the 6U5 "Power Frequency Comparator" lol.
(Only four screws at the corners, and one nut on the back hold it in the case, slips out with ease.The dial mechanics in center are normally covered with a sliding lid--shown) --Sorry for that first blurred pic.
Thanks

Edits: 05/14/16 05/14/16 05/14/16

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Topic - What industry used this hunk of American iron oscillator? - contrapuntal 18:18:50 05/14/16 (2)

RE: What industry used this hunk of American iron oscillator? - Triode_Kingdom 11:39:13 05/15/16 (0)

RE: What industry used this hunk of American iron oscillator? - Michael Samra 21:31:49 05/14/16 (0)

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