# Relationship history for MSHA mine 1201708

Current hierarchy: **Union Miniere S A → Bicknell Minerals Inc → Bicknell #1**

- 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:** Bicknell Minerals Inc → Bicknell #1; 1979-05-01 to 1981-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Day Parvin E → Bicknell #1; 1979-05-01 to 1981-07-08; source msha-controller-operator-history
- **controller_controls_operator:** Day Parvin E → Bicknell Minerals Inc; 1979-05-01 to 1981-07-08; source msha-controller-operator-history
- **operator_operates_mine:** Bicknell Minerals Inc → Bicknell #1; 1981-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Union Miniere S A → Bicknell #1; 1981-07-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Miniere S A → Bicknell Minerals Inc; 1981-07-09 to current/open; source msha-controller-operator-history