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| 7 Control knobs, Indexing mechanisms |
| GN164 Scale rings | 
| GN726 Control knobs | 
| GN726.1 Control knobs |
| GN726.2 Control knobs | 
| GN200 Indexing mechanisms with tension levers | 
| GN200 Indexing mechanisms |
| GN700 Adjustable knob | 
| GN215 Indexing levers |