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Publication of FR468111ApublicationCriticalpatent/FR468111A/en
G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
G01N31/22—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using chemical indicators
FR468111D1914-02-041914-02-04
Process for verifying the authenticity of postage stamps and all labels in general by canceling them at will
ExpiredFR468111A
(en)