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Courses and Examinations for Instrument Maintenance Mechanics. Nature 168, 145 (1951). https://doi.org/10.1038/168145d0
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DOI: https://doi.org/10.1038/168145d0
Nature volume 168, page 145 (1951)
Courses and Examinations for Instrument Maintenance Mechanics. Nature 168, 145 (1951). https://doi.org/10.1038/168145d0
Issue Date:
DOI: https://doi.org/10.1038/168145d0