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There are 3143 manhole covers that belong to category Unknown: Show on map Thumbnails mode
1951 Warsaw - round cover with squares (15)
1952 Manchester - diagonal Dreadnought
1953 St. John’s, NL - Confined Space (4)
1954 Manchester - BRITON - diagonal
1955 Arendal - A lid with a background of arrowheads
1956 Arendal - a lid with the city emblem on it
1957 Florence - Cover with a background of arrowheads
1958 Warsaw - Purator system
1959 Florence - cover with the letters SSS on it
1960 Florence - Cover with checkered background
1961 Warsaw - round cover with squares (16)
1962 Manchester - a lid whose shape is close to a triangle (3)
1963 Arendal - a cover designed for the tile manufacturer Skarpnes - modular
1964 Arendal - a cover that resembles a car steering wheel
1965 Manchester - VMR
1966 Arendal - cover for the Norwegian Road association - modular
1967 Florence - a cover with a background of diagonals and right angles
1968 Manchester - Broads
1969 Spoleto - Cover with a background of rhombuses
1970 Florence - small cap
1971 Chyżne - round lid
1972 Manchester - Estate Model Cover - Diagonal Modular
1973 Ružomberok - round lid with checkered background
1974 Ružomberok - round lid with radial squares
1975 Ružomberok - GLOBEX
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
Via Palazzo dei Duchi, 2, 06049 Spoleto PG, Italy
Via Vincenzo Gioberti, 74, 50136 Firenze FI, Italy
Chyżne 297A, 34-481, Poland
Burlington St, Manchester, UK
Bystrická cesta 5530, 034 01 Ružomberok, Slovakia
Bystrická cesta 5530, 034 01 Ružomberok, Slovakia
Bystrická cesta 190/6, 034 01 Ružomberok, Slovakia
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