You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when was the twin lens reflex camera invented?" whose answer is 1885.
Each document should contain about 30 words, and these documents should contain useful information.

Query: invention of twin lens reflex camera
Useful Output:

Doc 1: The Gowlandflex is a ginormous twin-lens reflex (TLR) camera invented by famous American glamour photographer Peter Gowland.
Doc 2: The era of analog SLRs began around 1938, this camera type became popular in the 1960's. Zoom lenses were invented in 1914 and started to become
Doc 3: After dabbling with a couple of stereo cameras, F&H introduced their first rollfilm TLR at end of 1928. It was simply called the Rolleiflex –
Doc 4: Popular from the 1940s to the 1960s, "Pseudo" Twin-Lens Reflex (TLR) cameras were cheaper versions of the popular TLR design made for the
Doc 5: It was made by Kamera Werkstätten Guthe & Thorsch in Dresden, Germany between 1931 and 1937. The folding design is unusual for a TLR, but not