> Technology 40 years ago was so simple, that anyone with basic education in electronics could understand how this or other basic utilities work and when opened

> Technology 40 years ago was so simple, that anyone with basic education in electronics could understand how this or other basic utilities work and when opened up could identify which component does what and if you identified a faulty component you could often easily replace it and thus repair it on your own, You’ve never seen an ISDN phone then (came only a few years after this one was made)