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| 1909 | Warren A. Cole and two other law students found Alpha Zeta of Lambda Chi Alpha at Boston University |
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| 05 DECEMBER 1912 | Seven Juniors at WPI organize Zeta Sigma Tau |
| SPRING 1913 | Warren Cole asks ZST to petition LCA |
| 28 MAY 1913 | Petition sent to LCA |
| 05 JUNE 1913 | Charter Granted, PZ is formed |
| 1939 | QKN and LCA merge |
| 1963 | 50th Aniversary of LCA PZat WPI |
| 08 AUGUST 1988 | Rush event incident, LCA PZ stops Operation |
| 1993 | PZ begins recolonization |
| 04 APRIL 1994 | PZ Re-Chartered |
| 01 DECEMBER 2000 | With a fresh rush class, PZ becomes the first chapter in New England with over 100 active members |
| 2002 | Membership passes P1500 |
| SUMMER 2003 | House renovations take place. Both roofs redone, all chimneys recapped, front entryway redone. |
| 2005 | How will you be remembered? |