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nycgov: OUT OF THE ARCHIVES, 1910: Drawing of a Type C manhole cover and frame from January 1910. According to a note on the drawing, Type C manhole frames are acceptable for use under vehicular traffic. Created by the Board of Water Supply during the construction of the Catskill system, it is an unusual design and unlike the manhole covers that are commonly seen in New York City.

nycgov:

OUT OF THE ARCHIVES, 1910: Drawing of a Type C manhole cover and frame from January 1910. According to a note on the drawing, Type C manhole frames are acceptable for use under vehicular traffic. Created by the Board of Water Supply during the construction of the Catskill system, it is an unusual design and unlike the manhole covers that are commonly seen in New York City.

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