# Relationship history for MSHA mine 4606636

Current hierarchy: **Arthur Fred R → G & L Coal Company → #1 Surface 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

- **operator_operates_mine:** G & L Coal Company → #1 Surface Mine; 1983-03-01 to 1985-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Graham David L → #1 Surface Mine; 1983-03-01 to 1985-01-17; source msha-controller-operator-history
- **controller_controls_operator:** Graham David L → G & L Coal Company; 1983-03-01 to 1985-01-17; source msha-controller-operator-history
- **operator_operates_mine:** G & L Coal Company → #1 Surface Mine; 1985-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur Fred R → #1 Surface Mine; 1985-01-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur Fred R → G & L Coal Company; 1985-01-18 to current/open; source msha-controller-operator-history