# Relationship history for MSHA mine 0301311

Current hierarchy: **Andrew  Sigel; Marcus  Rosenburg → R & S Coal Company → 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 & S Coal Company → No 1 Surface; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marcus  Rosenburg et al → No 1 Surface; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marcus  Rosenburg et al → R & S Coal Company; 1976-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Andrew  Sigel et al → R & S Coal Company; 1976-12-01 to current/open; source msha-controller-operator-history