Two kinds of HP-41 Blanknuts?

[rprosperi]

From a manufacturing point of view, it's (much) easier/cheaper to suppress printing entire horizontal lines. If you include the [CHS] and [EEX] labels, in order to retain the [ENTER] and [<-] labels, you really do lose the 'generic/simple' appearance that the BN has, and you need to explain what those mean, etc.

For double-shot keys, I assume the problems are similar, but honestly never was involved with that mfg. process.