Explanation of 'ULD' on Mamiya 105-210mm F4.5 Lens

Silenttortoise

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Have just received a Mamiya 105-210mm Lens and it has the acronym 'ULD' in the description. I am wondering what it means. I tried having a look at it on the internet, but frankly, after a while my eyes just glazed over:bonk:
Also, if I may, the lens cap had Schneider-Kreutznach on them.
Was this lens made by them and not Mamiya?
I know very little about Medium Format, as you have probably guessed.
I was wondering if all medium format lenses are leaf shutter.
I know this is probably at least three questions.:bang:
 
Ultra low distortion/dispersion?

boring explanation here. I'm not responsible if you fall asleep on your keyboard.
 
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