He was already experimenting with a violin with a metal resonator ... Corporation to produce the guitar that became to be known as the National Tricone. However, in 1928 disputes in the company ...

The dual-hollow-sphere-shaped optical microresonator is shown in Figure 1. The microcapillary (Polymicro, TSP075150) with inner and outer diameters of 76 µm and 151 µm is utilized to construct the ...