# Relationship history for MSHA mine 1510320

Current hierarchy: **Halcomb Leland → K-C Coal Company → #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Banks Curtis → #1; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Beehive Coal Company Inc → #1; 1977-04-01 to 1980-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Banks Curtis → Beehive Coal Company Inc; 1977-04-01 to 1980-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Madden Allen R → #1; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magnum Coal Company Inc → #1; 1980-10-15 to 1981-12-22; source msha-controller-operator-history
- **controller_controls_operator:** Madden Allen R → Magnum Coal Company Inc; 1980-10-15 to 1981-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Jamestown Resources Inc → #1; 1981-11-09 to 1983-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Blackey Elkhorn Coal Mining Company Inc → #1; 1981-12-23 to 1982-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Jamestown Resources Inc → Blackey Elkhorn Coal Mining Company Inc; 1981-12-23 to 1982-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Magnum/Quality Coal Company Inc → #1; 1982-11-01 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Collins Robert B → #1; 1982-11-01 to 1984-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Collins Robert B → Magnum/Quality Coal Company Inc; 1982-11-01 to 1984-02-27; source msha-controller-operator-history
- **operator_operates_mine:** K-C Coal Company → #1; 1984-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Halcomb Leland → #1; 1984-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halcomb Leland → K-C Coal Company; 1984-02-28 to current/open; source msha-controller-operator-history