# Relationship history for MSHA mine 1001346

Current hierarchy: **Smith Roger → Roger Smith-Drilling Inc → Abella**

- 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:** White Mining Contractors Inc → Abella; 1978-03-09 to 1979-02-19; source msha-controller-operator-history
- **controller_controls_mine:** White Mining Contractors Inc → Abella; 1978-03-09 to 1979-02-19; source msha-controller-operator-history
- **controller_controls_operator:** White Mining Contractors Inc → White Mining Contractors Inc; 1978-03-09 to 1979-02-19; source msha-controller-operator-history
- **operator_operates_mine:** Roger Smith-Drilling Inc → Abella; 1979-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Smith Roger → Abella; 1979-02-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Smith Roger → Roger Smith-Drilling Inc; 1979-02-20 to current/open; source msha-controller-operator-history