# Relationship history for MSHA mine 2601688

Current hierarchy: **Reagan Carrol → R & A Minerals → Battle Creek Tungsten 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** O M Lyman → Battle Creek Tungsten Mine; 1980-11-01 to 1981-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Lyman O M → Battle Creek Tungsten Mine; 1980-11-01 to 1981-12-21; source msha-controller-operator-history
- **controller_controls_operator:** Lyman O M → O M Lyman; 1980-11-01 to 1981-12-21; source msha-controller-operator-history
- **controller_controls_mine:** Newren David → Battle Creek Tungsten Mine; 1981-10-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knight-Roundy Mining Inc → Battle Creek Tungsten Mine; 1981-12-22 to 1983-01-26; source msha-controller-operator-history
- **controller_controls_operator:** Newren David → Knight-Roundy Mining Inc; 1981-12-22 to 1983-01-26; source msha-controller-operator-history
- **operator_operates_mine:** R & A Minerals → Battle Creek Tungsten Mine; 1983-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reagan Carrol → Battle Creek Tungsten Mine; 1983-01-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reagan Carrol → R & A Minerals; 1983-01-27 to current/open; source msha-controller-operator-history