The whole problem is that the author did not cite exactly the sources or the title of the monograph from which he drew drawings, descriptions, etc. ... this is a tradition here in the Czechoslovak Republic
500 kg bombs vz.34 never existed and the reasons: the army tested the effectiveness of bombs and found that it is not reasonable to waste bombs and buy expensive bombers capable of holding a reasonable number of heavy bombs. In addition, it had its own solution in the sense that the bombs allowed connection to the bottom of each other, ie especially for 50 kg of bombs.34 and thus the weight of the explosive falling into one place multiplied twice. Furthermore, for better placement of bombs, the variant "inner cell" was chosen and the placement of bombs in the fuselage perpendicular (at 10, 20 kg). bombs in the fuselage had better aircraft range and it was possible, among other things, to control the unlocking of the fuse.
For experiments with 500kg bombs, they had one type of Foker ... which was adapted for this purpose(At a time when the aviation industry was not at the required technical level ... then it was not current to deal with Fokr
Bombs made in France :
The bombs were of Czech construction, They bought the planes without bombs, of course.
-----
The General Staff counted on the air assistance of France in the invasion of Czechoslovakia, and for this purpose were prepared airports, ground supplies, ammunition, including bombs for French aicraft machines. The event was called by the code name "Units F". It was planned to adapt the Czech bombs to cells of the French type, D ,, mle 1923 .. and for that there was communication with the French side and a lot of paperwork for that ...
Akon