# Relationship history for MSHA mine 2301978

Current hierarchy: **David E  Bailey → Bailey Quarries Inc → Bailey Quarries Port #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:** David E  Bailey  et al → Bailey Quarries Port #1; 1985-04-03 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Masters-Jackson Inc → Bailey Quarries Port #1; 1988-02-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Bridges → Bailey Quarries Port #1; 1988-02-01 to 1991-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Bridges → Masters-Jackson Inc; 1988-02-01 to 1991-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Bailey Quarries Inc → Bailey Quarries Port #1; 1991-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Bailey  et al → Bailey Quarries Inc; 1991-04-01 to current/open; source msha-controller-operator-history