Terms for subject General containing not that I know of

English	Russian
has Smith been ill? — Not that I know of	Смит болел? — Насколько мне известно — нет
has Smith been ill? — Not that I know of	Смит болел? — Насколько я знаю — нет
not that I know of	по крайней мере, мне ничего об этом не известно ("She didn't file a complaint, not that I know of," he said. • Still no explanation (At least, not that I know of).)
not that I know of	по крайней мере, насколько я знаю ("She didn't file a complaint, not that I know of," he said. • Still no explanation (At least, not that I know of). • Nah, he ain't have nothing on him. Now, I don't think so. Not that I know of.)
not that I know of	насколько мне известно – нет
not that I know of it	у меня об этом нет никаких сведений
not that I know of it	мне об этом ничего не известно