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Detail of the top of the back of the seat.

The triangular apparatus at top is one side of the rocket-catapult attach point.

The large, red tag reads

Warning

52-82898-5
Before Removing Seat:
1. Install safety pin at Points A and D
2. Remove clevis pin from ejection initiator Point B and actuator firing mechanism Point C

The smaller, grey-white tag is a museum inventory tag:

Gemini Ejection Couch
SASM# 1293
Stafford Air & Space Museum