# Relationship history for MSHA mine 2301095

Current hierarchy: **Alexander Robert F → Howard County Coal Company → Howard County Coal Company Mine #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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** H & H Supply Company → Howard County Coal Company Mine #1; 1950-01-01 to 1978-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Hargis Lowell → Howard County Coal Company Mine #1; 1950-01-01 to 1978-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Hargis Lowell → H & H Supply Company; 1950-01-01 to 1978-02-17; source msha-controller-operator-history
- **operator_operates_mine:** Howard County Coal Company → Howard County Coal Company Mine #1; 1978-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alexander Robert F → Howard County Coal Company Mine #1; 1978-02-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alexander Robert F → Howard County Coal Company; 1978-02-18 to current/open; source msha-controller-operator-history