I think videodiscs are really cool. A lot of people mistake them for laserdiscs, but they were a stylus-read video format in the '80s–essentially 12" video records housed in big plastic caddies. They must have been the apex of phonograph-style analog A/V technology.
And don’t forget the in-car phonograph system.
Silent movies . . .
[by the way, Restoration Hardware sells* three-speed* record players!!]
Flintlock firearms.
You need an explanation for NES??? You HAVE to be over 30:
Nintendo Entertainment System
The original…
I don’t even know what those things are.
And tube amps abound.
I miss dialing a phone number.
Winding wristwatches.
I love my record player also! I will only listen to Dave Brubeck on my 1951 HI-FI!
Yeah, I had a '41 Plymouth with vacuum wipers. They’d stop when you stomped on the gas; I always used to say that anyone who’d try to drive uphill in the rain probably had it coming anyway :rolleyes:
Our '64 Rambler has vacuum wipers, too, but American Motors added a diaphragm to the fuel pump which augments the vacuum, so driving uphill in a downpour isn’t quite so lethal. Of course, by then everybody else had gone to electric wipers–Ramblers are kind of retrotech vehicles…
Letters. Despite our “instantaneous global communication ability”, email, satellites, and internet messaging, some manner of elegance and power in the written word has been lost now that we don’t typically spend much time to “compose” our thoughts before communicating them.
Nixie tubes = multifilament neon gas display device (see link above)
Clock-pots = clock dial faced ten-turn electrical potentiometer
Hill holder clutches = linked brake and clutch for incline starts
Key punch machines = puts holes in IBM punch cards
Candlestick telephones = old style upright telephone with separate earpiece and microphone sections
Yup, we’ve got ourselves a young’un here. I’m really, really confident you also knew all about the interchangeable Cinelli Bi-valent hubs.
I’m not too choked up about pneumatic tube systems. We have one here at the hospital and every time I hear the “clunk” I know it’s not going to be good news.
My favorite would be gramophones! Even better than record players. I have a small portable one, no horn alas, to play my 78s. No electrical plug, no batteries, purely mechanical. How cool is that? A bit hard to find needles though.
I think automats, as mentioned previously, would be neat too.
video phones… the ones dedicated to delivering your picture/voice to another person using a video phone on the other line. Not the shit that you can do with computers now. I remember when those things came out in the later part of the 90’s and i thought they were awesome. Then of course a year later i saw the other option… do it on your computer. but no doubt, dedicated video phones are nice.
I had an '86 Subaru GL 4WD wagon 5-spd a few years back. Great car! It had a hill holder clutch. Are those clutches all gone now?
I have an old record player (RCA) with speeds of 16, 33 1/3, 45, and 78. The needle flipped over for playing the 78s. (It’s in a box now, so I can’t verify that it flipped to a metal needle, but I think I remember it that way.) My Technics SL-1200 is a turntable. (Yeah, I used to DJ.) Don’t they still sell those new?
126 film cameras. 24 x 24 mm negs in a cartridge. Rollie, Kodak, Fuji, Yashica, etc… all made some very high quality camera systems for this format. Now it’s gone. 616 format, too. 
If you want to see what a clock-pot looks like, please check out this site. At the page top are a turns counting dial potentiometer (at right) and a classic clock-pot on the left.
Here’s an IBM keypunch machine.
These people still sell Nixie tubes.
Here are some images of candlestick telephones
Here’s a website about a 1941 Cadillac with the Norol hill holding clutch. Subaru re-introduced it in their more recent Forester model.
IIRC, you can buy 120 rollfilm and re-roll it into the 126 spools.
As for clock-pots, I first thought that was a typo of crock-pots, which aren’t really technology, or obsolete. Just a fine way to cook something like potroast.
120 roll film is 60mm across (a little more, but I’m not sitting here with a ruler, so I’m just going by memory.) . 126 was 24mm.
But, you can put 120 on 620 spools. I’ve seen different outfits offering that in the past.
Here’s a house that just had a pneumatic tube system installed. It can even handle sending you a beer from the kitchen. 
Frankly, I miss everything everyone’s mentioned, plus the stuff detailed in these books.
Well, I just read it as interchangeable <blah blah> hubs, and it sort of makes sense.
Thanks for the other stuff!
Pneumatic tube transport thingies are alive and well in warehouse markets like Loew’s, Home Depot, Sam’s, BJ’s, etc.
Of course they are also available in drive thru banks.
Oops… you’re right about 126 being different from 120/620. But, color print 126 is still available! Check out http://www.filmforclassics.com