Patent classifications
G
PHYSICS
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G03
PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
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G03H
HOLOGRAPHIC PROCESSES OR APPARATUS
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2240/00
Hologram nature or properties
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G03H2240/20
Details of physical variations exhibited in the hologram
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G03H2240/23
Optical length variations, e.g. bleached silver halide
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G03H2240/24
Index variations only
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