Phonograph record Gramophone trademark, Berliner started marketing records of 7 inches diameter with somewhat more substantial entertainment value, along with somewhat more substantial gramophones to play them. Berliner's records had poor sound quality compared to wax cylinders, but his manufacturing associate Eldridge R. Johnson eventually improved it. Abandoning Berliner's "Gramophone" trademark for legal reasons, in 1901 Johnson's and Berliner's separate companies reorganized to form the Victor Talking Machine Company in Camden, New Jersey, whose products would come to dominate the market for many years. Emile Berliner moved his company to Montreal in 1900. The factory, which became the Canadian branch of RCA
Kinetic diameter (data) points are moving linearly. This data structure is not local because one point may be in many antipodal pairs, and thus appear many times in the kinetic tournament. The existence of a local kinetic data structure for diameter is open. Efficiently maintaining the kinetic diameter of a point set in dimensions higher than 2 is an open problem. Efficient kinetic convex hull in dimensions higher than 2 is also an open problem. P. K. Agarwal, L. J. Guibas, J. Hershberger, and E. Verach. Maintaining the extent of a moving set of points. Kinetic diameter (data) A kinetic diameter data structure