# Relationship history for MSHA mine 1601037

Current hierarchy: **Deal Keith → Kad Industries Inc → Cameron Offshore**

- 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:** Camserv Drilling Fluids → Cameron Offshore; 1983-06-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Chesson Randall & Lilton Jr → Cameron Offshore; 1983-06-01 to 1987-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Chesson Randall & Lilton Jr → Camserv Drilling Fluids; 1983-06-01 to 1987-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Kad Industries Inc → Cameron Offshore; 1987-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Deal Keith → Cameron Offshore; 1987-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deal Keith → Kad Industries Inc; 1987-06-18 to current/open; source msha-controller-operator-history