# Relationship history for MSHA mine 1506438

Current hierarchy: **Kelly Fred & David--Fred Brassfield → F & E Coal Company → No 1 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Kelly Bob → No 1 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kellico Inc → No 1 Mine; 1973-01-01 to 1974-02-01; source msha-controller-operator-history
- **controller_controls_operator:** Kelly Bob → Kellico Inc; 1973-01-01 to 1974-02-01; source msha-controller-operator-history
- **operator_operates_mine:** Paul Coal Company → No 1 Mine; 1974-02-02 to 1975-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Kelly Bob → No 1 Mine; 1974-02-02 to 1975-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Kelly Bob → Paul Coal Company; 1974-02-02 to 1975-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Wildcat Coal Company → No 1 Mine; 1975-09-19 to 1977-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Wildcat Coal Company → No 1 Mine; 1975-09-19 to 1977-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Wildcat Coal Company → Wildcat Coal Company; 1975-09-19 to 1977-04-19; source msha-controller-operator-history
- **operator_operates_mine:** F & E Coal Company → No 1 Mine; 1977-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kelly Fred & David--Fred Brassfield → No 1 Mine; 1977-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kelly Fred & David--Fred Brassfield → F & E Coal Company; 1977-04-20 to current/open; source msha-controller-operator-history