# Relationship history for MSHA mine 4606400

Current hierarchy: **Henry Paul  Kizer → Amigo Smokeless Coal Company → Amigo #4**

- 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:** Roy L  McCoy et al → Amigo #4; 1977-06-24 to 1999-05-20; source msha-controller-operator-history
- **operator_operates_mine:** Last Chance Coal Company → Amigo #4; 1981-09-01 to 1986-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Roy L  McCoy et al → Last Chance Coal Company; 1981-09-01 to 1986-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Amigo Smokeless Coal Company → Amigo #4; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Henry Paul  Kizer et al → Amigo #4; 1986-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry Paul  Kizer et al → Amigo Smokeless Coal Company; 1986-12-01 to current/open; source msha-controller-operator-history