Bricks With Cross-Support, Mold 181

Logo: modern logo
Material: ABS
Inner wall: thin with vertical ridges
Inner ribs: Between the outer ridges on the long and short side. There is a double line on one long side of number 2.
Inner tubes: gripper tubes (octagonal inside).
Flowrib / center line inside top surface: No.
Mold pip: on the stud.
Mold number: 181, below the left tube.
Mold position numbers: 1 to 8, also below the left tube and separated from the mold number by a dash (-).
Intellectual property protection: None.
Design ID (3001): Yes, above the left tube.
Remarkable features: Minor mold error on the number 2 brick.
Colors known: White, Yellow, Blue. Gray.

One of the long walls of this brick has a double inner rib.

The moldmaker made a minor error here.

[Original posts and comments of Flickr: overview, detail.]

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