# Relationship history for MSHA mine 1700785

Current hierarchy: **Carl  Vainio → CARL VAINIO → Colonial 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:** Monson Maine Slate Company → Colonial Mine; 2005-09-16 to 2006-03-09; source msha-controller-operator-history
- **controller_controls_mine:** Lauri C Vainio → Colonial Mine; 2005-09-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lauri C Vainio → Monson Maine Slate Company; 2005-09-16 to 2006-03-09; source msha-controller-operator-history
- **operator_operates_mine:** CARL VAINIO → Colonial Mine; 2006-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Vainio → Colonial Mine; 2006-03-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Vainio → CARL VAINIO; 2006-03-10 to current/open; source msha-controller-operator-history