1105
The Tektronix 1105 is a portable AC power source (battery pack with inverter).
The unit contains a battery consisting of 20 type "F" NiCd cells, a charger, deep-discharge protection circuit and 120-Watt inverter providing a 60 Hz, 110 V square-wave output on two sockets.
See also the 1106 battery pack that was co-designed with the 1105.