# Relationship history for MSHA mine 4605476

Current hierarchy: **Patrick H  Cunningham; Frank O  Cunningham → Ten-A-Coal Company → Koon 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

- **controller_controls_mine:** Frank O  Cunningham et al → Koon Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** West Fork Construction Company Inc → Koon Mine; 1977-04-01 to 1979-03-12; source msha-controller-operator-history
- **controller_controls_mine:** Richards Dian → Koon Mine; 1977-04-01 to 1979-03-12; source msha-controller-operator-history
- **controller_controls_operator:** Richards Dian → West Fork Construction Company Inc; 1977-04-01 to 1979-03-12; source msha-controller-operator-history
- **operator_operates_mine:** West Fork Construction Inc → Koon Mine; 1979-03-13 to 1980-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Cunningham Carl → Koon Mine; 1979-03-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cunningham Carl → West Fork Construction Inc; 1979-03-13 to 1980-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Ten-A-Coal Company → Koon Mine; 1980-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Frank O  Cunningham et al → Ten-A-Coal Company; 1980-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patrick H  Cunningham et al → Ten-A-Coal Company; 1980-05-29 to current/open; source msha-controller-operator-history