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uitvindingen inventions spaarnestad photo spaarnestadphoto gasaanval gas war gaswar pram perambulator kinderwagen gasmasker gas mask gasmask england engeland hextable blackandwhite black and white Nationaal Archief Spaarnestad Photo Het Leven Fotograaf onbekend SFA. Testen van een kinderwagen die bestand is tegen mogelijke gasaanvallen.