# Relationship history for MSHA mine 4604803

Current hierarchy: **Crabtree David A → G E M Inc → No 2 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Guyan Eagle Investment Company → No 2 Mine; 1974-08-21 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Guyan Eagle Mining Company → No 2 Mine; 1975-01-01 to 1981-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Guyan Eagle Investment Company → Guyan Eagle Mining Company; 1975-01-01 to 1981-07-14; source msha-controller-operator-history
- **operator_operates_mine:** G E M Inc → No 2 Mine; 1981-07-15 to 1981-09-08; source msha-controller-operator-history
- **controller_controls_mine:** Winters Ken → No 2 Mine; 1981-07-15 to 1981-09-08; source msha-controller-operator-history
- **controller_controls_operator:** Winters Ken → G E M Inc; 1981-07-15 to 1981-09-08; source msha-controller-operator-history
- **operator_operates_mine:** G E M Inc → No 2 Mine; 1981-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Crabtree David A → No 2 Mine; 1981-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crabtree David A → G E M Inc; 1981-09-09 to current/open; source msha-controller-operator-history