# Relationship history for MSHA mine 3602131

Current hierarchy: **Grego Stanley F → B G P T Coal Company → No 6 Slope**

- 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:** Grego & Dietz Partners → No 6 Slope; 1950-01-01 to 1976-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Grego & Dietz Partners → No 6 Slope; 1950-01-01 to 1976-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Grego & Dietz Partners → Grego & Dietz Partners; 1950-01-01 to 1976-03-24; source msha-controller-operator-history
- **operator_operates_mine:** B G P T Coal Company → No 6 Slope; 1976-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grego Stanley F Et Al → No 6 Slope; 1976-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grego Stanley F Et Al → B G P T Coal Company; 1976-03-25 to current/open; source msha-controller-operator-history