# Relationship history for MSHA mine 2601369

Current hierarchy: **Lewis Frank W → F W Lewis Company → Mina Gold 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

- **operator_operates_mine:** F W Lewis Company → Mina Gold Mine; 1950-01-01 to 1986-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Lewis Frank W → Mina Gold Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Frank W → F W Lewis Company; 1950-01-01 to 1986-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Pischel Harold → Mina Gold Mine; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Pischel Mining Company Inc → Mina Gold Mine; 1986-04-23 to 1987-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Pischel Harold → Pischel Mining Company Inc; 1986-04-23 to 1987-12-08; source msha-controller-operator-history
- **operator_operates_mine:** F W Lewis Company → Mina Gold Mine; 1987-12-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis Frank W → F W Lewis Company; 1987-12-09 to current/open; source msha-controller-operator-history