IBM 704 - Manual (Page 143)

Removing Memory-Module Kits
2. Remove the memory board:
a. Disconnect the memory board from the system board by
rotating the memory-board corner handles outward to a
90-degree angle from the memory board.
b. Grasp the memory-board corner handles and carefully slide
the memory board out of the slot. Avoid touching the
components and gold-edge connectors on the memory
board.
3. Place the memory board, component-side up, on a flat,
static-protective surface.
Chapter 4. Installing Options 125