# Relationship history for MSHA mine 3800351

Current hierarchy: **Charles D  Taylor → Taylor Clay Products → Grover Shale 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:** Charles D  Taylor → Grover Shale Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Taylor Clay Products → Grover Shale Mine; 1978-03-09 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Taylor → Taylor Clay Products; 1978-03-09 to 1980-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Randle Brothers Inc → Grover Shale Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Randle Brothers Inc → Grover Shale Mine; 1980-07-01 to 1988-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Randle Brothers Inc → Randle Brothers Inc; 1980-07-01 to 1988-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Taylor Clay Products → Grover Shale Mine; 1988-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles D  Taylor → Taylor Clay Products; 1988-04-01 to current/open; source msha-controller-operator-history