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It's not all about 2 x 4's
I have an obsession with slotted bricks, mainly Lego bricks.
Here are some of my Lego 1 x 2's, i've the other sizes too.
Are there others out there that share my madness, i know some of you but i'm sure there are others.

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Comments
There are many of us that have the same obsession for individual parts. You can find us, and our collections....... Here.
The columns represent versions of slots relative to type of logo or lack of.
column
No stud logo bricks.
1 : Small block letter logo slot above that logo.
2 : Small block letter logo slot below that logo.
3 : Small block letter logo double slot.
4 : Large block letter logo slot above that logo.
5 : Large block letter logo slot below that logo.
6 : Large block letter logo double slot
7 : No logo, no mould number, single slot.
8 : No logo, mould number, single slot.
9 : No logo, mould number, double slot.
10 : Dogbone logo, double slot.
11 : Dogbone logo, single slot
Below column 7 are no slot versions of those above.
Bottom left corner are variations of mould, no mould versions of the stud logo slotted bricks.
Those starting below column 9.
1st : Hollow stud and small block letter underneath, slot at top.
2nd : As above but slot down.
3rd : As above, double slot.
4th : Hollow stud underneath with logo on stud and small block letter underneath, slot down.
5th : As above, double slot.
The red are As The 1st above but all show the same missing stud, unknown why this is.
I may be splitting some in the future into a different category but i need to do more checking.
At some point I'd like to get some more early color variations and some hollow bricks with logos on the studs and underneath. I've got some waffle plates like that, but they are fairly common
As a side note, I personally hate the term dogbone logo. I think it's terrible description of the style of logo. It took me years to figure out what people were talking. Does anyone know where this came from? I keep wondering if it's a literal translation of the Danish or German. Personally I'd referee to these as barbell or dumbbell logos. At least in US English it's a much better description. Ok, rant over.
I agree it's an odd name for the logo but one most use, i didn't have a clue as to what it was when I first encountered the phrase.
I should be posting some hollow brick pictures soon including the closed off slot brick versions.
The origin of dogbone may be something Gary can clarify, if i've heard it, i've forgotten it.
These were the easiest to mount, the other sizes need a lot more sorting yet, but hope to post later, i haven't included the marbled either.
Anyone have any colours/shades you don't see above, especially black, they must exist ?
Are there any bricks of particular interest to you, something you would like me to post photo's of if I have any ?
Love to see what you have if you are happy to share.
I save all the few old bricks I come across.
But I hadn't thought of doing both
Adds something a little different to any brick collection, not forgetting the sideways logo 2 x 4's that you may also find.
The first country to sell the no-slot (still hollow bottom) bricks was Germany in March of 1956. Denmark, Sweden and Norway kept selling the slotted brick sets as long as they had those bricks and associated windows/doors in inventory. Denmark didn't start selling windows with studs on top (classic windows) until February of 1957... so slotted bricks were still being sold until then. In Norway the retailer catalog for the 2nd half of 1957 still sold slotted bricks and the windows for them. That was the actual end of the slotted bricks.
The tube bottom bricks were first produced in late 1957, although the famous patent wasn't obtained until January 1958. The 1956-58 hollow bottom non-slotted bricks first sold in Germany in 1956 were still found in some LEGO sets in 1958. Everything depended on when the inventory of parts ran out. This is what makes dating the start or end of early LEGO parts so very difficult to determine.
Hope to post some images of the bricks from the period of the change from slotted to hollow, the slotted bricks with closed slots.
There's an obvious mark/s where the slots used to be, both logo underneath and double logo, on studs and underneath.
I started sorting my bricks with split tubes for you, but I have not found time to finish that. I currently have seven yellow bricks on my table for you, they have been there for months...