From Leica Wiki (English)
- Code names - OHTEO = OIPVO + OIFCO
- Production era - ca.1954-1957
- Type - Stereo viewing device with OIPVO as the stereo viewer and OIFCO as the lamp attachment behind the viewer. A dual slide container is inserted from above for viewing. Laney reports that the plastic housing of the OHTEO grows brittle with age.
- Reference - Page 38 of Dennis Laney's Leica 1984 Accessory Guide courtesy of Mike Butkus.