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Sliders on display at the Phoenix Rock Gym

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Go-Pro, - August 1986 advertisement

(No plastic touches nut)

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Go-Pro,  - June 1987 advertisement

(Two plastic tubes touches nut)

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Go-Pro, - December 1987 advertisement

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Go Pro - crack tester for Rock 'n' Roller devices - display item
- Donated by: Karl Guthrie
- c.1987

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