Cassette tapes, VCRs, and now we are coming close to CDs becoming obsolete.
Typewriters and black and white TV's
Most of the above, and
Slide rules (mechanical calculator)
analog transmission of information
Wrist Watches
Regular Brick and Mortar 🏦s
Stamps and Envelopes
Thick Yellow Pages
Good Customer Service
US base Customer Service
Common Sense and Manners
Personal Responsibility
Family Loyalty
Law Abiding Citizens
mimeographs
word processors
Children as remote controls
lp,s 45. Eight tracks cassettes black n white tv. Type writer. Automobile ossilliscope. Newspapers verysoon. Magazines. Sears catalogs. Yellow pages. Store brochures or store books with price list
Record stores, Hallmark stores, video/DVD rental stores, Bartles and James, Drive in theatres, rotary phones, an apple for the teacher, phone booths, address books, travel agents, calling for the time. I'M OLD!!!!
A lot of things have become obsolete over the past decade in general. The oldest thing I can remember that I was around for is the classic NES.
But one thing that will never become obsolete
Floppy discs
Film developing
Blockbuster stores
Pay phones
PDA's
Good manners
Cords! I remember when it was a luxury to use the phone at home and be able to walk freely around the house. I have noticed phones do not have cords, speakers are now Bluetooth, chargers don't have cords, etc.
Poloroid cameras, where your pictures came out developed. White go go boots. Brylcreem.
VHS / Video tape. There so massive and the quality is bad compaired to todays standards.
The ability to tell one gender from the other with any certainty. 😕
Besides the above ...
BETAMAX
Bakelite phones
Party lines
Local switchboard operators
What about all the classes in Middle/High School:
Home Economics
Music
Woodworking
Electronics
Chivalry.... I don't know if I have word or spelling correct.
Non-recoil starters on small gas engines. You had to rewind the starter cord each time.
The water-bags you hung from the hood ornament to cool water when driving.
Curb feelers
Directional signals by hand. I recall the first car I drove that had actual turn indicators. So modern.
Dashboard choke handles.
Flash bulbs