Sixteen unmarkable articles
On this page14
A resistor
A body a few millimetres long carrying colour bands that already encode its value. There is no room for a word, let alone a country name.
A ferrule
A metal sleeve crimped onto a wire end. Perhaps 6 mm long and mostly consumed by the crimp.
A solder pellet
Which is a lump of alloy. Marking it indelibly would mean marking something that is about to be melted.
A crimp terminal and a ring terminal
Both deformed in use, so a mark applied before crimping may not survive the crimp.
Heat shrink
Which changes dimension when used. A mark sized before shrinking is a different mark afterwards.
Which is an interesting case for indelibly
The mark can survive and still become illegible, because the substrate moved. Permanence and legibility are separate requirements.
An LED and a diode
Both small and both with a polarity convention already encoded in their shape. Adding a word is not available.
Two kinds of fuse
A glass fuse carries its rating printed on a metal cap, which is already the only markable surface and is already used.
A wire nut and a splice cap
Which have a little more surface, and are moulded in a colour that encodes their wire range. The colour is the information.
A cable clip and a toggle switch
The two largest articles in the group, and the two most plausibly markable. A switch body does carry markings in practice.
So the group runs from impossible to plausible
Which is exactly what a proportional standard is for: as the nature of the article will permit.
And for most of the sixteen the answer is the container
Which the statute authorizes in its own parenthesis, and is why this is the right spine for this group.
Or the exception, where an article is incapable of being marked
Which is the third tier and is a determination made elsewhere, not here.