# Relationship history for MSHA mine 1518920

Current hierarchy: **Jason  Shymlock; Aaron D  Smith → Redline Construction, LLC → Coaltech 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Blackwater Development LLC → Coaltech Mine #1; 2005-09-12 to 2005-09-26; source msha-controller-operator-history
- **controller_controls_mine:** Aaron D  Smith  et al → Coaltech Mine #1; 2005-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron D  Smith  et al → Blackwater Development LLC; 2005-09-12 to 2005-09-26; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Shymlock  et al → Blackwater Development LLC; 2005-09-12 to 2005-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Redline Construction, LLC → Coaltech Mine #1; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Shymlock  et al → Coaltech Mine #1; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Shymlock  et al → Redline Construction, LLC; 2005-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aaron D  Smith  et al → Redline Construction, LLC; 2005-09-27 to current/open; source msha-controller-operator-history