# Relationship history for MSHA mine 0102796

Current hierarchy: **Beech James D → C & B Ready Mix Inc → Clarke 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

- **controller_controls_mine:** Beech James D → Clarke Pit; 1988-12-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** C & B Ready Mix Inc → Clarke Pit; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Beech James D → C & B Ready Mix Inc; 1989-04-01 to current/open; source msha-controller-operator-history