Bannet SV.2 1936 ...
An extensive article about this project is included in "Dutch Aviation History".
I'm not sure I understand the point of strip-mining Herman Dekker's entire website. But, if you are determined to do it, search his site for your specific subjects so that you can combine the information to add some value.
In this instance, see:
https://hdekker.info/DIVERSEN/tcgroot.htm
It also helps to give context and define acronyms used in your clippings and to avoid pointless/confusing translations. To wit:
Vliegtuigenfabriek Bannet = Zeist-based aircraft factory (no "Bannet Aircraft Factory" ever existed).
BvL =
Bewijs van Luchtwaardigheid - a Certificate of Airworthiness.
"Factory number" =
Fabrieksnummer or construction number; in other words, c/n B.3 was assigned.
"Messrs Kelder and Stokfleth" = J. Kelder and G.H. Stokfleth of the Stichtsch-Gooische Kleine Luchtvaartclub (SGKL) [1]
"Mr. Large" = Seriously? T.C. Groot, the constructor, was also the owner of a lumber yard. [2]
RSL =
Rijksstudiedienst voor de Luchtvaart (1919-1937), roughly the 'National Office for the Study of Aviation'.
"Ist noch im bau begriffen" = [German] 'Is still under construction'.
"Dutch Aviation History" =
Nederlandse Luchtvaartgeschiedenis
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[1] The SGKL was a glider club based at Hilversum (~15 km south of Zeist). Note that 'G.H. Stokfleth' was also the name of a machinery factory (later Stokfleth Machines; now operating under the Stoxon brandname). So, we can't be sure if the firm was offering support for this Bannet project or the G.H. Stokfleth mentioned was the owner (or a scion) with a passion for gliding. As far as I can tell, J. Kelder was a lawyer. So, likely another enthusiastic amateur.
[2] In the link given above, Dekker described that business as "Naaml. Vennootschap HOUTHANDEL voorheen T.C. Groot". So, T.C. Groot had once been the owner of an eponymous business which was now nameless (
Naamloos). [Edit: see reply
#50]
Perhaps that suggests that Groot had fallen on hard times. Or maybe he too was just an aviation enthusiast ... who happened to have easy access to some of the needed raw materials?