Dräger Lt. Lund II oxygen rebreather - what chemical?

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What was the chemical composition of the carbon dioxide absorbent in Dräger Lt. Lund II oxygen rebreather? Ca(OH)2 (as in limewater) or CaHNaO2 (from natron) or sodium peroxide Na2O2 or sodium hyperoxide NaO2 or something else?

I am gathering information for a short article on Finnish historical diving societys website, and I'm not that knowledgeable when it comes to 1950's or scrubber chemicals.
 
According to the Draeger Manual they used 'Atemkalk', which usually is a mix of Ca(OH)2 and NaOH, in former times was also KOH and Ba(OH)2 used as 'Atemkalk' (Wikipedia).
Sorry, but I couldn't tell you what exactly had been used for the 'Leutnant Lund II'........
 
The US Navy used barium hydroxide tubular pellets in their rebreathers will into the 1970s. I can't remember the manufacturer but it was packaged in quart milk cartons and changed color when depleted.
 
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