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| The back cover has a very sturdy folder which has a cut-out holding a removable Correntator sliding rod calculator. This part may be flipped out so that the Correntator is always visible. | |
| Total images: 18 | Help | |
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| The back cover has a very sturdy folder which has a cut-out holding a removable Correntator sliding rod calculator. This part may be flipped out so that the Correntator is always visible. | |
| Total images: 18 | Help | |