prov:value
| - Application May 25, 1951, Serial No. 228,180 18 Claims. (Cl. 343-17) This invention relates to recording devices and more particularly to a method, apparatus and product involving two or more dimensional records in space of the existence, magnitudes, quantities, qualities, changes and interrelations in matter, energy, force, motion, impulses or other phenomena occurring in space, time or distance,
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