LC Subject Heading: Scientific equipment--Maine--Portland
Item 12409
Neutron reactor shell, Portland Company, ca. 1970
Contributed by: Maine Historical Society Date: circa 1970 Location: Portland Media: Photographic print
Item 12538
Chapman electric neutralizing machine, Portland Company, ca. 1904
Contributed by: Maine Historical Society Date: circa 1904 Location: Portland Media: Ink on paper
