DOCUMENT 68 DECEMBER 1907 ADSX. [35 329]. 81 Dated by the stamp "Exp. 11 Dez 1907 A.B." on the document. Probably the Swiss Patent Office's registration number of the patent application. Patent lawyers, located at Spitalgasse 32 (see Adressbuch Bern 1908). The full description of the patent application is "Alternating Current Machine with Short- Circuit Brushes and Opposing Auxiliary Spools for Spark Prevention" ("Wechselstromkollek- tormaschine mit Kurzschlußbürsten und diesen gegenüberliegenden Hilfsspulen zur Funken- vermeidung") it is dated 1 December 1906 (see printed Patentschrift Nr. 38853, SzBeBgE). Einstein's interest in this case may have rested in part on experiences gathered in his fa- ther's and uncle's firms in Munich, Pavia, and Milan (see Vol. 1, "Albert Einstein-Beitrag für sein Lebensbild," pp. li-lv), as well as on his own work with the Habicht brothers (see the ed- itorial note, "Einstein's 'Maschinchen' for the Measurement of Small Quantities of Electrici- ty," pp. 51-55). In contrast to German and American practice and more in keeping with French proce- dures, Swiss patent applications concentrated on a clear formulation of the claimed invention and did not involve a determination of its utility or priority (see Bundesgesetz betreffend die Erfindungspatente vom 21. Juni 1907, in Schweizerisches Bundesblatt 59, no. 28 [29 June 1907], articles 26 and 3). Einstein later stressed that "the work on the definitive formulation of technical patents [was] a real blessing for me" ("die Arbeit an der endgültigen Formulierung technischer Patente [war] ein wahrer Segen für mich") (see Einstein 1955, p. 147 manuscript and typescript versions of this reminiscence are in the Einstein Archives, [1 205] and [1 206]). A second complaint, also in Einstein's hand, was filed on 11 February 1908 (see Sz-Ar, E 22/2338, Dossier Einstein) and took issue with a supplementary patent application of 14 No- vember 1907 (see printed Patentschrift Nr. 39988, SzBeBgE). 68. To Rudolf Ladenburg Bern. 20. XII 07 Geehrter Herr Dr! Sehr erfreut über Ihr Interesse an jener Arbeit, sende ich Ihnen 3 Exempla- re (eines für Sie, zwei für die beiden andern Herrn. Hochachtungsvoll Ihr ergebener A. Einstein Patentamt Bern. AKS (Georg Mandl, Netstal, Switzerland). [81 179]. The verso is addressed "Herrn Dr. R. La- denburg Physikalisches Institut Breslau," and postmarked "Bern Brf.Exp. 20.XII.07.-3." Ladenburg (1882-1952) was Privatassistent in physics at the University of Breslau. The two individuals in question may be Max Born (1882-1970) and Fritz Reiche (1883- 1969). Born had recently received his doctorate from the University of Göttingen and was at- tending lectures at the University of Breslau. Reiche had obtained his doctorate a month earlier from the University of Berlin and was continuing his physics studies in Breslau. Born later claimed that Ladenburg was so caught up in "enthusiasm" ("Eifer") about rela- tivity that he visited Einstein in the summer-probably of 1909-to persuade him to attend the 81st meeting of the Gesellschaft Deutscher Naturforscher und Ärzte, which was held in Salzburg in September 1909 (see Max Born to Carl Seelig, 8 January 1953, SzZE Bibliothek, Hs. 304:228). Einstein attended the meeting and delivered a lecture on radiation theory, in which relativity was touched upon as well (see Einstein 1909c [Vol. 2, Doc. 60]).