G7273 grant continuity card
The G7273 grant continuity card was dual width card which plugged into the C and D connectors of an SPC slot or MUD slot in a UNIBUS backplane, in an otherwise-empty slot, and carried the bus grant line signals from the 'in' pins to the 'out' pins in the slot.
In all SPC and MUD backplanes, there was normally a wire-wrap jumper on the rear of the backplane for the NPG line, which had to be removed before a DMA device could be plugged into that slot. The G7273 allowed such a device to be removed, without the necessity of replacing the jumper.
Later PDP-11's, such as the PDP-11/84, made extensive use of the G7273, instead of the G727, so that there was no need to have, or remove, those jumpers.