# Relationship history for MSHA mine 1516892

Current hierarchy: **Roberts Clayton → Clayton Roberts Mining → No 1**

- 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:** Roberts Clayton → No 1; 1986-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Apache Energy Inc → No 1; 1990-05-01 to 1991-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Mc Keehan Darrell → No 1; 1990-05-01 to 1991-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Mc Keehan Darrell → Apache Energy Inc; 1990-05-01 to 1991-02-25; source msha-controller-operator-history
- **operator_operates_mine:** Clayton Roberts Mining → No 1; 1991-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Clayton → Clayton Roberts Mining; 1991-02-26 to current/open; source msha-controller-operator-history