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Recently I was given a biscuit tin of old Lego when a relative moved house. Nothing very interesting in it so it'll probably go to a charity shop. But I did notice that some of the 2x4 bricks were missing the little reinforcement thingy on the middle tube underneath the brick which is present on modern bricks. I'm curious when that change happened. Anyone know?
The picture shows what I mean. Top, newer bricks; bottom, older bricks.