# Relationship history for MSHA mine 4002806

Current hierarchy: **Crass Ronnie & Richard → Double R 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:** 4-C'S → No 1 Surface; 1982-09-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Crass Neil & Tim R → No 1 Surface; 1982-09-01 to 1984-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Crass Neil & Tim R → 4-C'S; 1982-09-01 to 1984-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Double R Coal Company Inc → No 1 Surface; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crass Ronnie & Richard → No 1 Surface; 1984-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crass Ronnie & Richard → Double R Coal Company Inc; 1984-10-01 to current/open; source msha-controller-operator-history