# Relationship history for MSHA mine 2300252

Current hierarchy: **David E  Bailey → Bailey Quarries Inc → CHESAPEAKE QUARRY**

- 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:** Griesemer Stone Company → CHESAPEAKE QUARRY; 1950-01-01 to 1979-09-12; source msha-controller-operator-history
- **controller_controls_mine:** John F  Griesemer et al → CHESAPEAKE QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Griesemer et al → Griesemer Stone Company; 1950-01-01 to 1979-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Louis A  Griesemer et al → Griesemer Stone Company; 1950-01-01 to 1979-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Ottendorf Stone Inc → CHESAPEAKE QUARRY; 1979-09-13 to 1985-04-02; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Ottendorf → CHESAPEAKE QUARRY; 1979-09-13 to 1996-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Ottendorf → Ottendorf Stone Inc; 1979-09-13 to 1985-04-02; source msha-controller-operator-history
- **operator_operates_mine:** Bailey Quarries Inc → CHESAPEAKE QUARRY; 1985-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David E  Bailey  et al → CHESAPEAKE QUARRY; 1985-04-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David E  Bailey  et al → Bailey Quarries Inc; 1985-04-03 to current/open; source msha-controller-operator-history