# Relationship history for MSHA mine 1515666

Current hierarchy: **Bailey Lexie → Kenlick & Tip Top Coal Company Inc → #2 Surface**

- 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:** Bailey Lexie → #2 Surface; 1986-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bennett Energy Coal Company Inc → #2 Surface; 1986-06-01 to 1987-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Taylor Fields Et Al → #2 Surface; 1986-06-01 to 1987-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Taylor Fields Et Al → Bennett Energy Coal Company Inc; 1986-06-01 to 1987-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Kenlick & Tip Top Coal Company Inc → #2 Surface; 1987-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey Lexie → Kenlick & Tip Top Coal Company Inc; 1987-04-23 to current/open; source msha-controller-operator-history