# Relationship history for MSHA mine 3607557

Current hierarchy: **Ken  Snyder → Ken Snyder Inc → Henry Clay Bank**

- 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:** Elwood  Swank → Henry Clay Bank; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Split Vein Coal Company Inc → Henry Clay Bank; 1984-03-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Elwood  Swank → Split Vein Coal Company Inc; 1984-03-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Ken  Snyder → Henry Clay Bank; 2009-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ken Snyder Inc → Henry Clay Bank; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ken  Snyder → Ken Snyder Inc; 2011-08-01 to current/open; source msha-controller-operator-history