# Relationship history for MSHA mine 3607641

Current hierarchy: **Deglau Louis E → Kelt Inc → Crabtree Site**

- 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:** Kelt Inc → Crabtree Site; 1984-11-28 to 1988-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Deglau Louis E → Crabtree Site; 1984-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deglau Louis E → Kelt Inc; 1984-11-28 to 1988-08-26; source msha-controller-operator-history
- **controller_controls_mine:** O'Hara David C → Crabtree Site; 1986-10-01 to 1989-01-05; source msha-controller-operator-history
- **operator_operates_mine:** G K & G Inc → Crabtree Site; 1988-08-27 to 1988-09-27; source msha-controller-operator-history
- **controller_controls_operator:** O'Hara David C → G K & G Inc; 1988-08-27 to 1988-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Kelt Inc → Crabtree Site; 1988-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deglau Louis E → Kelt Inc; 1988-09-28 to current/open; source msha-controller-operator-history