# Relationship history for MSHA mine 4406185

Current hierarchy: **Vandyke Leon & James Messer → Quality Coal Corp → No 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:** Mc Clanahan Donald Keith → No 1; 1984-06-22 to 1990-02-26; source msha-controller-operator-history
- **operator_operates_mine:** Mc Clair Mining Corp → No 1; 1985-02-01 to 1989-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Mc Clanahan Donald Keith → Mc Clair Mining Corp; 1985-02-01 to 1989-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Black Mountain Coal Company Inc → No 1; 1989-07-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Deel William → No 1; 1989-07-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Deel William → Black Mountain Coal Company Inc; 1989-07-01 to 1991-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Quality Coal Corp → No 1; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vandyke Leon & James Messer → No 1; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vandyke Leon & James Messer → Quality Coal Corp; 1991-04-01 to current/open; source msha-controller-operator-history