# Relationship history for MSHA mine 1512105

Current hierarchy: **Florida Progress Corporation → Kentucky May Coal Company Inc → Tipple #6**

- 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:** United  Company → Tipple #6; 1977-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Magoffin Coal Inc → Tipple #6; 1979-10-01 to 1986-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Terry Charles  Marshall → Tipple #6; 1979-10-01 to 1986-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Terry Charles  Marshall → Magoffin Coal Inc; 1979-10-01 to 1986-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Belfry Coal Corp → Tipple #6; 1986-02-28 to 1990-09-12; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Belfry Coal Corp; 1986-02-28 to 1990-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Florida Progress Corporation → Tipple #6; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky May Coal Company Inc → Tipple #6; 1990-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Florida Progress Corporation → Kentucky May Coal Company Inc; 1990-09-13 to current/open; source msha-controller-operator-history