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jan 1, 1973 - The earliest known use of a bulletin board system by Aperture Science. (Portal ARG)

Description:

- 1973
- The earliest known use of a bulletin board system by Aperture Science.

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Half-Life and Portal Universe Timeline

ByThe Fancy Fedora

25 Dec 2018

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8496

Date:

jan 1, 1973

Now

~ 52 years ago

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