1936-38: Contax: PP SLR project called Syntax starts in Dresden.
1939-1945: World War II. Dresden heavily bombed, prototypes/drawings destroyed.
1946/May: Rectaflex: Telemaco Corsi starts PP SLR project.
1946: Contax: New group settled
to restart the PP SLR project.
1947/April:Rectaflex: 1.mod 947 partly functioning shown at Milano Fiera.
1948/April:Rectaflex: mod Standard 947, fully functioning, shown at Milano Fiera.
1948/June:Rectaflex: starts production of preseries
1948/August:Contax S:1. prototype (A) shown at St.Eriks Fare in Stockholm.
1948/September:Rectaflex starts series production of A 1000 series.
sales and export to USA and France.
1948/Late:Rectaflex: 1. series partly withheld/withdrawn due to problems with long sh. times.
1949/March:Contax: Contax S prototype B/preseries shown at Leipzig Fair.
series B 2000 at Fiera Milano, production started.
1949/September:Rectaflex starts prod. series B 3000
1949/September:Contax S: starts series production and later sales.
1949/December: Contax S: stops production
due to problems
1950/March: Contax S restarts production
The only facts from this list that could possibly lead to the conclusion that Contax was just ahead of Rectaflex, is the introduction of the Contax in Leipzig in March
1949, while Rectaflex introduced their B 2000 series in Milano in April. So, if one did not know that Contax was still months away from serial production, while Rectaflex was already producing their second series, then yes, Contax was first!