{"@context":{"@vocab":"https://schema.org/"},"@type":"ItemList","@id":"https://api.morvs.ai/api/v1/msha/by-controller?name=Seidl%20Nelson","controller":"Seidl Nelson","_source":{"data_provider":"AI Analytics","brand_name":"MORVS","brand_url":"https://morvs.ai/","data_provider_url":"https://api.morvs.ai","license":"https://creativecommons.org/publicdomain/zero/1.0/","primary_source":"https://arlweb.msha.gov/OpenGovernmentData/OGIMSHA.asp","generated_at":"2026-11-02T18:47:52.145Z"},"count":1,"truncated":false,"mines":[{"mine_id":"1900010","mine_name":"Merrimack Granite Company Incorporated","coal_metal_ind":"M","mine_type":"Surface","mine_status":"Abandoned","state":"MA","county_name":"Middlesex","controller_name":"Seidl Nelson","operator_name":"Merrimack Granite Company Inc","num_employees":null,"primary_canvass":"Stone","canonical_url":"https://api.morvs.ai/mine/1900010"}]}