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1 янв 1972 г. - Aperture Science constructs at least Chambers 01 and 02 of the Propulsion Gel Testing Facility. (Portal 2 - Trivia)

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- 1972
- Aperture Science constructs at least Chambers 01 and 02 of the Propulsion Gel Testing Facility.

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Half-Life and Portal Universe Timeline

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1 янв 1972 г.

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