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| 1850–1??? | 1???–1??? | 1???–19?? | 19??–1935 | 1935–1977 | 1977–1990 | 1990–present |
North-Western Police Agency[]
1850–1???[]
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LOGO MISSING |
Pinkerton & Co[]
1???–1???[]
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LOGO MISSING |
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UNKNOWN YEAR |
Pinkerton's National Detective Agency[]
1???–19??[]
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BETTER LOGO NEEDED |
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UNKNOWN YEAR |
Pinkerton[]
19??–1935[]
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LOGO MISSING |
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UNKNOWN YEAR |
1935–1977[]
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SVG NEEDED |
1977–1990[]
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Icon 
Wordmark
1990–present[]
