# Relationship history for MSHA mine 1509765

Current hierarchy: **Stevens Randall Joe → R J S Coal Company Inc → No 1 Surface**

- 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:** R J S Coal Company Inc → No 1 Surface; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Stevens Randall Joe → No 1 Surface; 1976-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stevens Randall Joe → R J S Coal Company Inc; 1976-06-01 to current/open; source msha-controller-operator-history