# Relationship history for MSHA mine 0301555

Current hierarchy: **Rice Sam → Sam'S Coal Company → Sam'S Coal Co #1**

- 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:** Sam'S Coal Company → Sam'S Coal Co #1; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rice Sam → Sam'S Coal Co #1; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rice Sam → Sam'S Coal Company; 1983-06-01 to current/open; source msha-controller-operator-history