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The Diamond–Dunmore system was an early blind landing system developed by Harry Diamond and Francis Dunmore at the National Bureau of Standards in the late 1920s. It was similar to the beam landing systems being developed in the UK and Germany shortly thereafter, but had the added advantage that the directional signal was automatically decoded and displayed on a cockpit indicator, rather than requiring the attention of a radio operator. It also added an optional vertical guidance system to provide a glideslope indication. In spite of the advanced nature of the system, or perhaps because of it, the system does not appear to have been widely used. In contrast, the simpler Lorenz system was widely deployed in Europe.