# Relationship history for MSHA mine 3304186

Current hierarchy: **Edward E  Smock → West Point Mining Corp → Mine #7**

- 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:** Vernon D  Richmond → Mine #7; 1987-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sheridan Coal Company → Mine #7; 1990-02-01 to 1990-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Vernon D  Richmond → Sheridan Coal Company; 1990-02-01 to 1990-07-15; source msha-controller-operator-history
- **operator_operates_mine:** West Point Mining Corp → Mine #7; 1990-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Edward E  Smock → Mine #7; 1990-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward E  Smock → West Point Mining Corp; 1990-07-16 to current/open; source msha-controller-operator-history