Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication date
Publication of BE590209ApublicationCriticalpatent/BE590209A/xx
G02B13/00—Optical objectives specially designed for the purposes specified below
C—CHEMISTRY; METALLURGY
C07—ORGANIC CHEMISTRY
C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
C07F7/22—Tin compounds
C07F7/2208—Compounds having tin linked only to carbon, hydrogen and/or halogen