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The Edwards 270-SPO is the most common and most recognizable Edwards pull station, which is the "teardrop" style of it. It has many counterparts, but this page will cover the SPO, which is the single-stage conventional pull station. This pull station was introduced sometime in the 1950s, and is still being made today, but branded by General Electric. It went through several changes over the years.
Variations
- 270-GAO: Same as the 270-SPO, but is two-stage and has a key in the lever.
- 270-DPO: Same as the 270-SPO, but is double-pole.
History
First generation
The first ever generation of this pull station had the classic Edwards "E" square shield logo on the bottom, the iconic "PULL IN CASE OF FIRE" on the handle, and FIRE ALARM at the top. This version is the most rare. This style was introduced in the 1950s, and was phased out around 1970.
Second generation
This generation is the same as the first, but deletes the "FIRE ALARM" at the top of the station. Introduced around 1970 and phased out around 1986.
Third generation
This generation includes a logo change to the newer shield, and a different "PULL IN CASE OF FIRE" font, and FIRE ALARM at the top. This version is perhaps the most common. It was introduced around 1988 and phased out around 2009.