# Relationship history for MSHA mine 1102622

Current hierarchy: **Klever Larry → Larry Klever-Owner → Davis 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Porter Brothers Inc → Davis Quarry; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Porter John Et Al → Davis Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Porter John Et Al → Porter Brothers Inc; 1950-01-01 to 1979-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Larry Klever-Owner → Davis Quarry; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Klever Larry → Davis Quarry; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klever Larry → Larry Klever-Owner; 1979-07-01 to current/open; source msha-controller-operator-history