Electronic distance measurement (EDM) was introduced around 1960, when the prototype instruments became small enough to be used in the field.

Its release demonstrated a move away from virtual instruments and computers that Jarre had been using up to that point; he instead chose to use a simplified range of devices, including several new prototype instruments.

The R&D team spent months building and testing prototype instruments.

The prototype instrument and data pipeline were designed and built by Grzegorz Pojmański.

In 1983, Federal funds were restored - on a subsistence level, but enough to begin designing prototype instruments.

It was a prototype instrument which had cost somewhere in the region of $18, 000.

Of course there are some woods in the ebony family which could pass for rosewood, and vice versa, and as this is a prototype instrument, anything's possible.

As this is a prototype instrument I'll assume that the string fault I've mentioned has already been spotted and rectified, otherwise any criticism is a matter of personal preference.

In the period between 2000-2005, Landman created 9 prototype instruments.

With Japanese colleagues, Milne, Ewing and another Briton, Thomas Lomar Gray, devised the prototype instruments which evolved into the modern seismograph.