# Relationship history for MSHA mine 2300154

Current hierarchy: **Martin Marietta Materials Inc → Hunt Martin Materials L.L.C. → Randolph Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Great Midwest Mining Corp → Randolph Mine; 1950-01-01 to 1985-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Great Midwest Corp → Randolph Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Great Midwest Corp → Great Midwest Mining Corp; 1950-01-01 to 1985-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Midwest Enterprises → Randolph Mine; 1985-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hunt Midwest Mining Inc → Randolph Mine; 1985-06-15 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises → Hunt Midwest Mining Inc; 1985-06-15 to 2005-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Midwest Enterprises et al → Randolph Mine; 2005-02-01 to 2014-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Hunt Martin Materials L.L.C. → Randolph Mine; 2005-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises et al → Hunt Martin Materials L.L.C.; 2005-03-01 to 2014-04-02; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc et al → Hunt Martin Materials L.L.C.; 2005-03-01 to 2014-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Randolph Mine; 2014-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hunt Martin Materials L.L.C.; 2014-04-03 to current/open; source msha-controller-operator-history