Blackline (or Black Line, according to some sources) was designed by German graphic artist Wolf Magin (1927–2009). In 1969, he drew letterforms made from thick and thin parallel lines, and used it to create 39 serigraphs. This series, titled Experimenta litera, was first exhibited in 1975 in Ludwigshafen and published in a catalog (source: kunstundkosmos.de).
According to Luc Devroye, Berthold released Magin’s Blackline as a font in 1976. Mike Yanega of Bowfin Printworks has a sample in his Lined Font Identification Guide, taken “from Art Deco Display Alphabets by Dan X. Solo”.
There are at least four digital versions of Blackline; the crappy Banderole (1990–1992) by FontBank, Inc., and DXS Blackline by Dick Pape (2009, 2010), the very limited Lively Display Caps (1993, 1996) by Weatherly Systems, Inc., and the nicer and more mature Linea Nera NF (2011) by Nick Curtis.
See also Glaser and Chwast’s Filmsense.