button reflector造句

In its heyday, Magnetic Signal not only manufactured wigwag signals, but also the alternating-flasher type railroad signals, reflectorized " Railroad Crossing " signs, button reflectors for highway signs, traffic island beacons, curb beacons, flasher relays, automobile and bicycle reflectors, and even a " Portafount " portable drinking fountain.
In 1949 50, as part of a research program into freeway signing carried out by the California Department of Transportation, Series E Modified was developed from Series E by thickening the stroke width to accommodate button reflectors for ground-mounted signs, while a lowercase alphabet was developed to allow mixed-case legend ( consisting initially of Series D and lowercase letters ) to be used on externally illuminated overhead signs.
It's difficult to find button reflector in a sentence. 用button reflector造句挺难的