# Relationship history for MSHA mine 0500979

Current hierarchy: **L G Everist Inc → L G Everist Inc → Silverthorne North**

- 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:** L G Everist Inc → Silverthorne North; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fulton Concrete → Silverthorne North; 1950-01-01 to 1982-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Fulton John W → Silverthorne North; 1950-01-01 to 1982-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Fulton John W → Fulton Concrete; 1950-01-01 to 1982-08-12; source msha-controller-operator-history
- **operator_operates_mine:** L G Everist Inc → Silverthorne North; 1982-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** L G Everist Inc → L G Everist Inc; 1982-08-13 to current/open; source msha-controller-operator-history