Prontor
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The Prontor is a series of leaf shutters that were made by the German company Gauthier.
The Prontor II exists with the following speed ranges:
- T, B, 175, 100, 50, 25, 10, 5, 2, 1
- 200, 100, 50, 25, 10, 5, 2, 1, B, T
The Prontor-SV is a later model, exisiting with 1, 2, 5, 10, 25, 50, 100, 250, B speed range.