# Relationship history for MSHA mine 1301222

Current hierarchy: **Mid America Materials Company → Hallett Materials → Harlan Plant**

- 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

- **operator_operates_mine:** G A Finley Inc → Harlan Plant; 1950-01-01 to 1989-01-31; source msha-controller-operator-history
- **controller_controls_mine:** G A  Finley → Harlan Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** G A  Finley → G A Finley Inc; 1950-01-01 to 1989-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Mid America Materials Company → Harlan Plant; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hallett Materials → Harlan Plant; 1989-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mid America Materials Company → Hallett Materials; 1989-02-01 to current/open; source msha-controller-operator-history