# Relationship history for MSHA mine 0201987

Current hierarchy: **Buckway R Dix → Geneva Mines Ltd → Lead Bullet**

- 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:** Cerbat Mining Corp → Lead Bullet; 1980-05-01 to 1982-03-03; source msha-controller-operator-history
- **controller_controls_mine:** Law Donald L → Lead Bullet; 1980-05-01 to 1982-03-03; source msha-controller-operator-history
- **controller_controls_operator:** Law Donald L → Cerbat Mining Corp; 1980-05-01 to 1982-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Geneva Mines Ltd → Lead Bullet; 1982-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Buckway R Dix → Lead Bullet; 1982-03-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Buckway R Dix → Geneva Mines Ltd; 1982-03-04 to current/open; source msha-controller-operator-history