Means only creator would have that knowledge, but in the case of your previous question-not true. the wire is readily available & specs all over the place.
no one knows.
god knows which inventor
According to historians, nobody knows the first inventor.
only the inventor knows
Who knows how many things he inverted. But if you mean invent, like i think you do, none. He was not an inventor.
A famous inventor!! Eveyone knows that.
no one really knows, otherwise the answer would be on here
No one knows. It was about 1000 years ago, probably in China.
It means inventor
The ruler was invented in 1675 and unfortunately, to this day, no one knows by whom it was invented.
Nobody really knows who first said this idiom.
Nobody really knows when the inventor of the first flushing toilet was born