# Relationship history for MSHA mine 1200775

Current hierarchy: **Avery B  Alton; R Rex  Alton → Rex Alton Companies, Inc. → St Thomas Pit**

- 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:** Rex Alton Companies, Inc. → St Thomas Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** R Rex  Alton et al → St Thomas Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** R Rex  Alton et al → Rex Alton Companies, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Avery B  Alton et al → Rex Alton Companies, Inc.; 1950-01-01 to current/open; source msha-controller-operator-history