I can't really say about what you have as I have never seen them, but they would have to be pre 1971. Here is my fully complete 70s-80s era kit(The guy who helped me get it took this photo, I have the kit but it's packed away at the moment).
-Gas Mask Bag
-M51 Gas Mask with Filter
-Set of 2 Autropine Injectors in Plastic Box
-Powder Tube for Burns
-Dosimeter
-Set of Radiological Decontamination Wipes
-Detection Paper
-Antitoc Powder
-Decontamination Glove
-Bandage for Burns
-Booklet IF46 - Survive in the Fight
-Card with Alarm Signals
This is a by the book setup from 1972 into the early 90s. Your items must either not really be from the M51 kit or are from the 50s-60s era, cool items nonetheless. I love NBC items and those are pretty neat.
Here, from my notes:
Each soldier was issued a little booklet called "Overleven in het Gevecht(Survive in the Fight)", according to one from 1971 and one from 1980, each soldier had the following:
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Overleven in het Gevecht 1971
-Vloeipapier
Blotting Paper to remove liquid agents from skin
-Ontsmettingspoeder
Decontamination Powder for skin, comes in a box
-Antineurotox-Ampullen
NBC Syringe
-Radiologisch Huidontsmettingsmiddel
Radiological Decontamination Wipe for skin
-Verband
Bandage for Burns
-Poeder voor Brandwonden
Powder for Burns
-Antishock Poeder(Antitoc)
Powder for Shock, pour in water then drink
-Eerste-Hulp-Verbandzakje
Normal Bandage for Wounds
-----------------------------
Overleven in het Gevecht 1980
-Detectiepapier
Detection Paper
-Verband voor Brandwonden
Bandage for Burns
-Poeder voor Brandwonden
Powder for Burns
-Poeder-Handschoenen
Glove with Decontamination Powder, to blot and decontaminate skin
-Radiologisch Huidontsmettingsmiddel
Radiological Decontamination Wipe for skin
-De Atropine-Spuitjes
Atropine Injectors
-Eerstehulpverbandzakje
Normal Bandage for Wounds
As you can see, over the 9 years in between, some stuff changed. The Blotting Paper & Decontaminating Powder were replaced by the Powder Glove and the Anti Neurotox Syringe was replaced by Atropine Injectors. The Anti Shock Powder was discontinued and the Detector Paper was introduced.
I also have a Manual from 1978 that mentioned the following:
-Flesje Ontsmettingspoeder(Bottle of Decontamination Powder)
-Twee Flesjes met 50 Tabletten(Two Bottles with 50 Tablets)
It also mentions the Burn Powder and Bandage, Powder Glove, Detector Paper, and Decontamination Wipes.
So we know that the Powder Glove and Detector Paper were introduced sometime after 1971 and before 1978, and the Anti Shock Powder was discontinued in that same time. Haven't been able to find any info on the tablets or the bottle of powder, only mentioned in the 1978 manual, and the Decon Powder from the 1971 booklet came in a box.
The one packet of your on the right might be the Syringe? Not really sure.