7mm phone jack

["Roger.Norwood" bigrogsound]

I think I must have been asleep! Just when did the quarter-inch jack become=
 the 7mm phone jack?
I used to use quarter-inch tape in the past, discussions of which have appe=
ared in this group frequently but nobody refers to it as 7mm tape do they?
I know when the mini-jack arrived it was known as the 3.5mm jack, as it did=
n't quite measure/8th inch, but presumably the inventor/developer decided t=
o design it from a metric beginning.
The quarter-inch jack was originated in imperial, not metric measurements a=
nd I can only ever call it a quarter-inch or mono jack and refer to the ste=
reo version as balanced or TRS depending on its use or context. Perhaps it =
measures 7mm but its not how I see it.
Roger