| http://www.w3.org/ns/prov#value | - In the case of a crystal which is suspended between the first and second disk from its peripheral portion, it is especially desirable to provide, in the central portion of the electrode-bearing silica disks, a recess of the order of one micron to a few dozen microns, thus making it possible for the electrode which has been deposited by metallization in the recess of the disk, to be itself recessed
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