# Relationship history for MSHA mine 4404980

Current hierarchy: **Hank K  Matney; Fred D  Matney; Rick A  Matney → Tri-M Coal Company → No 1 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:** Tri-M Coal Company → No 1 Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rick A  Matney  et al → No 1 Mine; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick A  Matney  et al → Tri-M Coal Company; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred D  Matney  et al → Tri-M Coal Company; 1978-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hank K  Matney  et al → Tri-M Coal Company; 1978-02-01 to current/open; source msha-controller-operator-history