Balanced Door Entrances (08 42 36)
Utrecht University Installs Towering Boon Edam Revolving Door at Main Entrance to Sciences Building (Feb 25, 2019)
Boon Edam Announces 2019 Technical Training Program in North America (Jan 15, 2019)
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For other relevant searches, you might want to try: entrances of any material that employ pivots to allow operation with minimum force.