# Relationship history for MSHA mine 1002074

Current hierarchy: **Wade  Olson → OK Gravel Works → Eljay Cone**

- 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:** Roadrunner Ready Mix → Eljay Cone; 2005-06-21 to 2012-07-23; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Olson Jr → Eljay Cone; 2005-06-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Olson Jr → Roadrunner Ready Mix; 2005-06-21 to 2012-07-23; source msha-controller-operator-history
- **operator_operates_mine:** OK Gravel Works → Eljay Cone; 2012-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wade  Olson → Eljay Cone; 2012-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wade  Olson → OK Gravel Works; 2012-07-24 to current/open; source msha-controller-operator-history