You will be given a definition of a task first, then some input of the task.
In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.

Passage: The first complete Tosca recording was made in 1918, using the acoustic process. The conductor, Carlo Sabajno, had been the Gramophone Company's house conductor since 1904; he had made early complete recordings of several operas, including Verdi's La traviata and Rigoletto, before tackling Tosca with a largely unknown cast, featuring the Italian soprano Lya Remondini in the title role. The next year, in 1919, Sabajno recorded Tosca again, this time with more well-known singers, including Valentina Bartolomasi and Attilio Salvaneschi as Tosca and Cavaradossi. Ten years later, in 1929, Sabajno returned to the opera for the third time, recording it, by the electrical process, with the orchestra and chorus of the Teatro alla Scala and with stars Carmen Melis and Apollo Granforte in the roles of Tosca and Scarpia. In 1938 HMV secured the services of the renowned tenor Beniamino Gigli, together with the soprano Maria Caniglia as Tosca and conductor Oliviero De Fabritiis, for a "practically complete" recording that extended over 14 double-sided shellac discs.
Link Information: none Answer: none
Output:
How many years after the acoustic press were shellac discs invented?