Expired patent.
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Issued in 1977…
I don’t think I’ve seen a 2 chambered bong quite like that.
I remember seeing some sketchy bongs in the early 70’s.
Units built from acrylic tubes & glue, bamboo & ceramic come to mind. I haven’t thought about that in a long while… 
The use borosilicate was a major game changer but I can’t quite remember when I saw the first one… I think it was mid 70’s?
Cheers
G
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Right, 1977. What I find interesting is the usage of two chambers and the kickhole (44) infused into the water. I’ve never seen this design in a glass bong.
So, not only was this designed for smokers, but it also used moisturized air when releasing the kickhole.
Around 1990 in Germany, there was a disgusting revival of plastic pipes, so let’s not talk about that. 
This is just so funny that someone describes scientifically, over three paragraphs, how a bong rip works
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i made a few interesting ones in the 90s from acrylics. they were easy to heat up a bit over the stove to twist or even blow out. problem with them was that you had to use a metal bowl and rubber grommet, screwed up the taste.
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Very interesting. So early.
Whats, that bong got a thump keg @breadwinner? 
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I heard the bong was invented in thailand made by bamboo they had always one at hand.
Somehow the bong is more traditional than we think.
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That looks so cool. I plan to visit glassblowing courses this year.
Maybe i manage to blow one like this.
Thx for sharing
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Sorry fail because of internet connection 
i said its like the chalice from Jamaica and that I use a lil wooden pipe from Jamaica sometimes , wich tastes nice because of the wood. Chalice (pipe) - Wikipedia
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I am not that fan of watching YTs but that one popped up smhow just today 
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In the mid 80’s my friend had that bong.
It was a nice and small travel pipe.
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This is the coolest bong i ever seen! I am curious how that works!
Σ(っ °Д °;)っ
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A Bong from a coconut must be fun too!
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Ich muss auch noch bis zu ende gucken, aber material, technick, rauchfreie hitzequelle… ich saach ma gefällt mir 
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this is the Stündenglas bong that costs 600€
it is a Rebrandable piece created in China, it costs 100€ if you order it there
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Very good quality, I’ve been ‘eyeballing’ one for years…
I just can’t bring myself to the point of buying (yet…) 
Cheers
G
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@Gpaw Shit you just brought back my highschool years in 2 seconds- I miss the cool acrylic stuff. 8’ acylic bongs, steam rollers, the damn gas masks hahaha Thanks for brightening my day with that
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Wait until u have to clean it. If you disasseble it comepletely an hour is realistic
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