# Relationship history for MSHA mine 3607598

Current hierarchy: **Deibel D C → Cambridge Industries Inc Of Ohio → Keisterville**

- 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:** Cambridge Industries Inc → Keisterville; 1984-07-01 to 1984-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Jones Edgar Et Al → Keisterville; 1984-07-01 to 1984-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Jones Edgar Et Al → Cambridge Industries Inc; 1984-07-01 to 1984-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Cambridge Industries Inc Of Ohio → Keisterville; 1984-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deibel D C → Keisterville; 1984-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deibel D C → Cambridge Industries Inc Of Ohio; 1984-10-23 to current/open; source msha-controller-operator-history