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There are 3143 manhole covers that belong to category Unknown: Show on map Thumbnails mode
1926 Copenhagen - a lid with a star in the center and circles of squares around it
1927 Manchester - BRUNEL - diagonal
1928 Warsaw - round cover with squares (14)
1929 Warsaw - a BRIO cover
1930 Copenhagen - Lid manufactured by Niemisen Valimo
1931 Drammen - cover and on it major sites in the city (2)
1932 Warsaw - lid made by a Turkish factory
1933 Copenhagen - a lid with a star in the center and circles of squares around it (2)
1934 Warsaw - Wilanów Palace Museum
1935 Copenhagen - A cover with a network of circles (3)
1936 Warsaw - a cover that resembles a car steering wheel
1937 Manchester - Old lid made by Baxendales & Co with rhombus background and one handle
1938 Copenhagen - A cover with a network of circles (4)
1939 Manchester - background consisting of the letters H tilted
1940 St. John’s, NL - ancon cover
1941 Stockholm - Lid manufactured by Pipelife International
1942 Manchester - concrete cover with short diagonal grooves
1943 Pisa - Quadro 40
1944 Florence - small square lid
1945 Florence - ISPEZIONE General Cover
1946 St. John’s, NL - Silent Knight - diagonal (3)
1947 Florence - square cover with arrowheads and 2 handles
1948 Manchester - cap made by Misterton Castings (2)
1949 Paris - a rectangular lid with a background of pegs - Modular
1950 St. John’s, NL - General cover made by Oldcastle
Sankt Annæ Pl. 4, 1250 København, Denmark
Aquatics Centre, Manchester M13 9SS, UK
Wąwozowa 36, 02-796 Warszawa, Poland
Kadetów 44, 03-987 Warszawa, Poland
Sankt Annæ Pl. 6, 1250 København, Denmark
Øvre Torggate, 3017 Drammen, Norway
aleja Dzieci Polskich 7, 04-730 Warszawa, Poland
Sankt Annæ Pl. 20, 1250 København, Denmark
Stanisława Kostki Potockiego 14, 02-958 Warszawa, Poland
Nørre Farimagsgade 64, 1364 København K, Denmark
Elektoralna 8/10, 00-139 Warszawa, Poland
80 Oxford St, Manchester M1 5NH, UK
Nørregade 80, 1358 København, Denmark
70 Oxford Rd, Manchester M1 7EF, UK
37 Anderson Ave, St. John’s, NL A1B 3E4, Canada
Sveavägen 42, 111 34 Stockholm, Sweden
70 Oxford Rd, Manchester M1 7EF, UK
Via dell’Aeroporto, 48, 56100 Pisa PI, Italy
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
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