# Relationship history for MSHA mine 3606448

Current hierarchy: **Kroh Michael A → T N T Coal Company → T N T Slope**

- 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:** P S & R Coal Company → T N T Slope; 1977-06-01 to 1982-02-07; source msha-controller-operator-history
- **controller_controls_mine:** Poletti Peter & James Shade Et Al → T N T Slope; 1977-06-01 to 1982-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Poletti Peter & James Shade Et Al → P S & R Coal Company; 1977-06-01 to 1982-02-07; source msha-controller-operator-history
- **operator_operates_mine:** M & S Coal Company → T N T Slope; 1982-02-08 to 1984-07-01; source msha-controller-operator-history
- **controller_controls_mine:** Shade Gary L & James--Homer J Morgan → T N T Slope; 1982-02-08 to 1984-07-01; source msha-controller-operator-history
- **controller_controls_operator:** Shade Gary L & James--Homer J Morgan → M & S Coal Company; 1982-02-08 to 1984-07-01; source msha-controller-operator-history
- **operator_operates_mine:** S & R Coal Company → T N T Slope; 1984-07-02 to 1989-06-11; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Rothermel et al → T N T Slope; 1984-07-02 to 1989-06-11; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Rothermel et al → S & R Coal Company; 1984-07-02 to 1989-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Roadside Coal Company → T N T Slope; 1989-06-12 to 1990-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Harner Roy E & Delbert L Artz → T N T Slope; 1989-06-12 to 1990-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Harner Roy E & Delbert L Artz → Roadside Coal Company; 1989-06-12 to 1990-03-12; source msha-controller-operator-history
- **operator_operates_mine:** Roadside Coal Company → T N T Slope; 1990-03-13 to 1990-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Stephen  Perchinski → T N T Slope; 1990-03-13 to 1990-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Perchinski → Roadside Coal Company; 1990-03-13 to 1990-11-15; source msha-controller-operator-history
- **operator_operates_mine:** T N T Coal Company → T N T Slope; 1990-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kroh Michael A → T N T Slope; 1990-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kroh Michael A → T N T Coal Company; 1990-11-16 to current/open; source msha-controller-operator-history