# Relationship history for MSHA mine 0301628

Current hierarchy: **Shell Oil Co & G C O Minerals Co → Benton Mining Partnership → Benton Lignite Mine**

- 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

- **controller_controls_mine:** Shell Oil Company → Benton Lignite Mine; 1981-07-01 to 1992-11-23; source msha-controller-operator-history
- **operator_operates_mine:** Shell Mining Company → Benton Lignite Mine; 1987-04-01 to 1988-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Company → Shell Mining Company; 1987-04-01 to 1988-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Mc George Contracting Company Inc → Benton Lignite Mine; 1988-05-11 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Dickinson H Tyndall → Benton Lignite Mine; 1988-05-11 to 1988-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Dickinson H Tyndall → Mc George Contracting Company Inc; 1988-05-11 to 1988-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Benton Mining Partnership → Benton Lignite Mine; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shell Oil Co & G C O Minerals Co → Benton Lignite Mine; 1988-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shell Oil Co & G C O Minerals Co → Benton Mining Partnership; 1988-10-01 to current/open; source msha-controller-operator-history