MSR - Mountain Safety Research
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MSR Ice Screws
c.1969 - Hard Snow and Ice Screw (Top) - Prototype (Middle) - Ice Screw (Bottom - smallest) ---8" shown (1969), 10" (1970) The ice screw with the square two hole handle bar is possibly a prototype. From: Greg Shaw 
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The MSR Ice Screw with the triangle handle bar is similar to the ice screw in the YC Collection, but the handle has a extra bend on it and the tube has a hole near the handle.
MSR November 1969 Newsletter
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The MSR November 1969 Newsletter lists:
- Ice Screw 7/8" x 8" in length tube - Hard Snow and Ice Screw 1.2" x 14" The MSR May 1970 Newsletter lists: - MSR Ice Screws 7/8" x 10" 1.2" x 14" 
MSR May 1970 Newsletter
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MSR Ice Screw
c. 1969 YC Collection 
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