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Railwaydoublediscsignal.png (318 × 408 pixels, file size: 24 KB, MIME type: image/png)
Summary
DescriptionRailwaydoublediscsignal.png |
中文:铁路双盘信号机,19世纪40年代出现,双盘绕木制或钢制信号杆旋转,但由于识别度不够明显,很快被淘汰。 |
Date | |
Source | Own work |
Author | Charlie fong |
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
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This file is licensed under the Creative Commons Attribution-Share Alike 4.0 International license.
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inception
13 June 2020
source of file
original creation by uploader
media type
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File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 16:40, 13 June 2020 | ![]() | 318 × 408 (24 KB) | Charlie fong | Uploaded own work with UploadWizard |
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Categories
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Annuals36
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Bulbs, Corms & Tubers41
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Ferns27
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Fruits3
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Garden Plants23
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Grasses26
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Herb17
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Insects1
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Mammals1
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Midwest Native Plants0
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Northeast Native Plants112
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Perennials123
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Rose1
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Shrubs47
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Trees112
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Tropical Plants53
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Upland Birds5
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Vines18
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Viola Tricolor1
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Water Gardening & Plants9
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Waterfowl0
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Wetland Birds0
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Wetland Plants4
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Wildbirds172
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Wildflowers1
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Woodland Plants29
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