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B.5: Calculations by Frisch, photographs, 'Ueber die spektrale Durchlässigkeit von Tauschichten', 3 pp. research notes or draft for paper.
B.6: Correspondence re apparatus, 1929. Correspondence with C. Müller re research and patents, 1929-30.
B.7: Correspondence re payment of Frisch's research grant, 1929. Miscellaneous items: CV by Frisch up to and including his work with Müller; timetable of laboratory visits March 1929.

Created while at Physikalisch-Technische Reichsanstalt (PTR) in Berlin.

Correspondence and papers re arrangements for Frisch to work with C. Müller at Physikalisch Technische Reichsanstalt, Berlin, payment of stipend, etc. 1927.
Includes Frisch's ms. CV, and Müller's testimonial to him, 1930.

Two letters only, on patent rights, and on equipment.