1.8 Control knobs, Indexing mechanisms

	GN 164 Scale rings Steel		GN 726 Control knobs Aluminum black anodized		GN 726.1 Control knobs Aluminum black anodized
	GN 726.2 Control knobs Aluminum black anodized		GN 723.2 Control knobs Zinc die casting silver metallic finish		GN 723.3 Reference flanges for GN 723.2
	GN 729 Control knobs Aluminum black anodized		GN 200 Indexing mechanisms Steel matt chrome plated		GN 200 Indexing mechanisms St. Steel
	GN 200 Indexing mechanisms Type B Steel		GN 200 Indexing mechanisms Type B Steel matt chrome plated		GN 200 Indexing mechanisms Type C Steel
	GN 700 Adjustable knob Steel		GN 215 Indexing levers Steel