What I was talking about was a Thailand 2 outlet extension cord. The outlets have holes like the mentioned adaptors, but as a matter of fact Euro plugs won't make proper contacts and eventually fall out of these oriental combo type. So my guess was that the type used in thailand (and maybe in Korea as well) is built for 4.8 mm pins. The lists I saw only give very vague opinions on this, they don't make any difference between the 2.5 A Europlug and the 16A rated ungrounded contour plug (shape of a Schuko plug but without ground contacts) with 4.8 mm pins).
SECAM was adopted by the eastern countries simply to keep people from watching western TV. However, soon PAL/SECAM TVs came out.
