# Relationship history for MSHA mine 1506401

Current hierarchy: **Carlton Charles → Moravia Coal Company → Prep Plant #2**

- 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:** Middle States Coal Company Inc → Prep Plant #2; 1950-01-01 to 1975-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Fon M → Prep Plant #2; 1950-01-01 to 1975-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Fon M → Middle States Coal Company Inc; 1950-01-01 to 1975-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Middle States Coal Company Inc → Prep Plant #2; 1975-07-31 to 1988-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Richard D → Prep Plant #2; 1975-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Richard D → Middle States Coal Company Inc; 1975-07-31 to 1988-03-10; source msha-controller-operator-history
- **operator_operates_mine:** H H & S Coal Company Inc → Prep Plant #2; 1988-03-11 to 1989-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Hollie → Prep Plant #2; 1988-03-11 to 1989-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Hollie → H H & S Coal Company Inc; 1988-03-11 to 1989-01-30; source msha-controller-operator-history
- **controller_controls_mine:** Smith Daniel F → Prep Plant #2; 1988-09-27 to 1992-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Emmanuel Processing Inc → Prep Plant #2; 1989-01-31 to 1990-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Burke John Jr → Prep Plant #2; 1989-01-31 to 1990-10-16; source msha-controller-operator-history
- **controller_controls_operator:** Burke John Jr → Emmanuel Processing Inc; 1989-01-31 to 1990-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Danmar Coal Company → Prep Plant #2; 1990-08-09 to 1991-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Smith Daniel F → Danmar Coal Company; 1990-08-09 to 1991-09-22; source msha-controller-operator-history
- **operator_operates_mine:** Moravia Coal Company → Prep Plant #2; 1991-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carlton Charles → Prep Plant #2; 1991-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carlton Charles → Moravia Coal Company; 1991-09-23 to current/open; source msha-controller-operator-history