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The sign advertises the Cyclone Fence Division of American Steel & Wire Co.
It also mentions United States Steel. Was American Steel & Wire Co. just a part of that (USS)?
Anyway, the address given is 5532 San Fernando Road, Glendale, Calif.
And the phone number, the reason for my interest, is CHapman 5-2635.
The sign also advertises locations in Oakland, San Francisco, Seattle, and Portland.
Though the use of 2L-5N is what most caught my attention, the typography is pretty neat, too. In particular, the big fat font used for the main text of "CYCLONE FENCE."