Why do some HP calculators have springs inside?

[lvt]

(12-25-2022 08:08 PM)Csaba Tizedes Wrote:  

(12-25-2022 06:38 PM)lvt Wrote:  Not even a single one.

Those three grey circle on the left part seems connection points to the metal plate, maybe I'm wrong.

Yes but it's plastic, I don't see how it helps with electromagnetism.

I bought my 12C brand-new in sealed blister. Model number is PHA127xxxx (27th week of 2021?).