- unitid
-
{"value"=>"1034334", "type"=>"local_mss"}
- unitdate
-
{"value"=>"1856-1924", "type"=>"inclusive", "normal"=>"1856/1924"}
{"value"=>"1903-1919", "type"=>"inclusive", "normal"=>"1903/1919"}
- date_inclusive_start
-
1856
- date_inclusive_end
-
1924
- keydate
-
1856
- date_start
-
1856
- date_end
-
1924
- unittitle
-
{"value"=>"<span class=\"persname\">Martin, Thomas Commerford</span>"}
- note
-
{"value"=>"See also: Electric World. See also: National Electric Light Assoc. In Edison Collection. See also: U. S. - Dept, of Commerce and Labor, Bureau of the Census."}