# Relationship history for MSHA mine 4604275

Current hierarchy: **Frazee Donald F → F & M Coal Company → Laurel Mt #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

- **operator_operates_mine:** Weter Company Inc → Laurel Mt #1; 1974-09-01 to 1979-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Weter Howard → Laurel Mt #1; 1974-09-01 to 1979-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Weter Howard → Weter Company Inc; 1974-09-01 to 1979-11-13; source msha-controller-operator-history
- **operator_operates_mine:** F & M Coal Company → Laurel Mt #1; 1979-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Frazee Donald F Et Al → Laurel Mt #1; 1979-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frazee Donald F Et Al → F & M Coal Company; 1979-11-14 to current/open; source msha-controller-operator-history