Elenco Electronics, Measuring Instruments, models:

K-38	Assembly And Instruction Manual
LP-525K	Assembly And Instruction Manual
M-2666K	Assembly And Instruction Manual
TT-400K	Assembly And Instruction Manual
TWT-1	Instruction Manual
TWT-1K	Assembly And Instruction Manual
XK-550	Instruction Manual
XK-550K	Assembly And Instruction Manual
XK-700	Instruction Manual
XK-700-SEMI	Assembly And Instruction Manual
XK-700K	Assembly & Instruction Manual