# Relationship history for MSHA mine 3606232

Current hierarchy: **Hooversville Coal Company → Intercarbon Coal Company → Intercarbon Preparation Plant**

- 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:** Triumph Coal Company → Intercarbon Preparation Plant; 1976-09-23 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Johnson Charles P Jr--Reed Eschalier Et Al → Intercarbon Preparation Plant; 1976-09-23 to 1978-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Johnson Charles P Jr--Reed Eschalier Et Al → Triumph Coal Company; 1976-09-23 to 1978-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Intercarbon Coal Company → Intercarbon Preparation Plant; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hooversville Coal Company Et Al → Intercarbon Preparation Plant; 1978-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hooversville Coal Company Et Al → Intercarbon Coal Company; 1978-08-01 to current/open; source msha-controller-operator-history