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There are 3114 manhole covers that belong to category Unknown: Show on map Thumbnails mode
1951 Florence - small square lid
1952 Florence - ISPEZIONE General Cover
1953 St. John’s, NL - Silent Knight - diagonal (3)
1954 Florence - square cover with arrowheads and 2 handles
1955 Manchester - cap made by Misterton Castings (2)
1956 Paris - a rectangular lid with a background of pegs - Modular
1957 St. John’s, NL - General cover made by Oldcastle
1958 Warsaw - round cover with squares (15)
1959 Manchester - diagonal Dreadnought
1960 St. John’s, NL - Confined Space (4)
1961 Manchester - BRITON - diagonal
1962 Arendal - A lid with a background of arrowheads
1963 Arendal - a lid with the city emblem on it
1964 Florence - Cover with a background of arrowheads
1965 Warsaw - Purator system
1966 Florence - cover with the letters SSS on it
1967 Florence - Cover with checkered background
1968 Warsaw - round cover with squares (16)
1969 Manchester - a lid whose shape is close to a triangle (3)
1970 Arendal - a cover designed for the tile manufacturer Skarpnes - modular
1971 Arendal - a cover that resembles a car steering wheel
1972 Manchester - VMR
1973 Arendal - cover for the Norwegian Road association - modular
1974 Florence - a cover with a background of diagonals and right angles
1975 Manchester - Broads
Piazza Lorenzo Ghiberti, 45 R, 50122 Firenze FI, Italy
Piazza Lorenzo Ghiberti, 42 R, 50122 Firenze FI, Italy
25 Dunfield St, St. John’s, NL A1A 1W2, Canada
Via Giosuè Carducci, 4, 50121 Firenze FI, Italy
3 Oxford Rd, Station Approach, Manchester M1 6FU, UK
1 R. Bréguet, 75011 Paris, France
249 Elizabeth Ave, St. John’s, NL A1B 1T6, Canada
Adama Branickiego 10, 02-972 Warszawa, Poland
3616 Station Approach, Manchester M1 5NF, UK
231 Elizabeth Ave, St. John’s, NL A1B 1T6, Canada
6 Oxford St, Manchester M1 5QA, UK
Torvet 1A, 4836 Arendal, Norway
Torvet 3, 4836 Arendal, Norway
Via Giotto, 28, 50121 Firenze FI, Italy
Stanisława Kostki Potockiego 21, 02-958 Warszawa, Poland
Piazza Cesare Beccaria, 10, 50121 Firenze FI, Italy
Via Vincenzo Gioberti, 165 R, 50121 Firenze FI, Italy
Powsińska 35, 02-903 Warszawa, Poland
All Saints Building, All Saints, Manchester M15 6BH, UK
Kystveien 20, 4841 Arendal, Norway
Langbryggen 26, 4841 Arendal, Norway
Lower Ormond St, Manchester M15 6HB, UK
Blødekjær 6, 4838 Arendal, Norway
Via Vincenzo Gioberti, 55/ROSSO, 50121 Firenze FI, Italy
Lower Ormond St, Manchester M15 6HB, UK
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