B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
B61L29/00—Safety means for rail/road crossing traffic
B61L29/24—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning
B61L29/26—Means for warning road traffic that a gate is closed or closing, or that rail traffic is approaching, e.g. for visible or audible warning mechanically operated
Landscapes
Engineering & Computer Science
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Mechanical Engineering
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Developing Agents For Electrophotography
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Photoreceptors In Electrophotography
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Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography
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