Lets make a list of items which hasn't basically changed over the years. Ok some items may have changed in size and shape and additional features and functions but basically they are still the same by principle.
Telephones (landlines): still using a base and handset
Earphones: still using a pin-plug, wire and earplugs (same for headsets)
Hard Drives: the basic concept hasn't changed for the past 50 years
Eye glasses: Over 2 centuries the same basic concept and design
The Keyboard: from typewriters to computer keyboards, the basic layout and design hasn't changed. Even with the advent of new keyboard layouts and designs for ergonomic purposes which don't seem to be around much.
can anyone think of other gadgets, items that we use in our daily average life that hasn't changed in the past century or more?