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The infamous IBM Boulder on the descent (approx 8 feet in diameter).

Id# 105814370,  Dimensions: 584 x 478 

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By Lee Jensen
Oct 2, 2006

Why is it called the IBM boulder?

By M.Morley
Administrator
From: Sacramento, CA
Oct 2, 2006

Maybe this will help. The old IBM Selectric typewriters used such "typeballs".

By George Bell
From: Boulder, CO
Oct 17, 2008

The link above seems to be dead. Here is a Wikipedia entry with a photo of a typeball.

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The infamous IBM Boulder on the descent (approx 8 feet in diameter).

Submitted By: George Bell on Apr 10, 2006
On this route:
Black Orpheus (5.9+ 5c 17 VI E1 5a )