# Relationship history for MSHA mine 1517806

Current hierarchy: **Bobby  Blackburn → Sundance Mining Inc → M&T**

- 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:** Kentucky May Mining → M&T; 1996-06-01 to 1998-01-06; source msha-controller-operator-history
- **controller_controls_mine:** Stanley W Osborne → M&T; 1996-09-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sister Bear Mining Inc → M&T; 1998-01-07 to 2000-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Stanley W Osborne → Sister Bear Mining Inc; 1998-01-07 to 2000-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Sundance Mining Inc → M&T; 2000-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Blackburn → M&T; 2000-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Blackburn → Sundance Mining Inc; 2000-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → M&T; 2000-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kentucky May Mining; 2000-11-30 to 1998-01-06; source msha-controller-operator-history