# Relationship history for MSHA mine 3607806

Current hierarchy: **Scott B  Kimmel → Michael Coal Company Inc. → Tremont Stripping**

- 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:** Michael Coal Company → Tremont Stripping; 1986-05-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Rohlic Joseph → Tremont Stripping; 1986-05-01 to 1988-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Rohlic Joseph → Michael Coal Company; 1986-05-01 to 1988-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Michael Coal Company → Tremont Stripping; 1988-09-09 to 2001-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Scheib Gary Et Al → Tremont Stripping; 1988-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scheib Gary Et Al → Michael Coal Company; 1988-09-09 to 2001-12-16; source msha-controller-operator-history
- **operator_operates_mine:** Michael Coal Company Inc. → Tremont Stripping; 2001-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Scott B  Kimmel → Tremont Stripping; 2001-12-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott B  Kimmel → Michael Coal Company Inc.; 2001-12-17 to current/open; source msha-controller-operator-history