(netherlands)
Coordinates: 52.049433909475404, 5.543149025447313
Area: 1.41256103515625e-05 km²
OSM tags:
abandoned:building: bunker
architect: Ministerie van Oorlog
bunker_type: pillbox
heritage: 2
heritage:operator: rce
historic:period: 1939 - 1956
material: concrete
military: bunker
model: S3A-type kazemat, bijnaam "Stekelvarken"
note: Grebbelinie
period: 1939 - 1951
ref: GL137
ref:rce: 528619
website: https://www.bunkerinfo.nl/2016/02/grebbelinie-s3a-kazemat-gl137.html