Context: Since the beginning of the study of electricity non conductive materials like glass, porcelain, paper and mica have been used as insulators. These materials some decades later were also well-suited for further use as the dielectric for the first capacitors. Paper capacitors made by sandwiching a strip of impregnated paper between strips of metal, and rolling the result into a cylinder were commonly used in the late 19century; their manufacture started in 1876, and they were used from the early 20th century as decoupling capacitors in telecommunications (telephony).

Question: Besides porcelain, paper and mica, what other non conductive material was used as an insulator? 
Answer: glass

Question: For what use were non conductive materials used in the first capacitors?
Answer: as the dielectric

Question: What was layered between strips of metal in order to create paper capacitors?
Answer: strip of impregnated paper

Question: When were paper capacitors first manufactured?
Answer: in 1876

Question: What other use did paper capacitors serve in the telecommunications industry?
Answer: as decoupling capacitors

Question: Besides porcelain, paper and mica, what other conductive material was used as an insulator?
Answer: Unanswerable

Question: For what use were conductive materials used in the first capacitors?
Answer: Unanswerable

Question: What was layered between strips of plastic in order to create paper capacitors?
Answer: Unanswerable

Question: What happened in 1877?
Answer: Unanswerable

Question:  What other use did metal capacitors serve in the telecommunications industry?
Answer: Unanswerable