I have seen a number of WW2 era engines restored and installed in various things. They feature the metal mesh covered lines, and the brightly colored anodized fittings. Were these actually in use in WW2. Although I was still a school kid at the end of the war, I don't remember seeing this stuff on engines then.
When did the metal mesh covered lines come into use? When did the colored anodized fittings come into use?