Hand-held gas sampler by J H Naylor Ltd of Wigan
1950-1970
1950-1970
1954-10-21
c.1850
1940-1960
1860-1870
circa 1943
1960
1755-1765
1967-12
1968-04-05
1957-04-02
1992
2001-02-14
1896
1982
circa 1948
1861-1880
1861-1880
-1882
1861-1880
circa 1960
1980-1988
2000-08-09
1861-1880
circa 1984
1970