# Relationship history for MSHA mine 1508532

Current hierarchy: **Howard Billy Ray & Alvis Lee Smith → Lowe'S Branch 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Progressive Energies Coal Company Inc → No 1 Mine; 1975-01-01 to 1976-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Terry → No 1 Mine; 1975-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Terry → Progressive Energies Coal Company Inc; 1975-01-01 to 1976-03-04; source msha-controller-operator-history
- **operator_operates_mine:** Windjay Coal Company → No 1 Mine; 1976-03-05 to 1976-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Applebaum Robert J → No 1 Mine; 1976-03-05 to 1976-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Applebaum Robert J → Windjay Coal Company; 1976-03-05 to 1976-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Winjay Coal Company Inc → No 1 Mine; 1976-09-01 to 1977-05-24; source msha-controller-operator-history
- **controller_controls_mine:** Hubbard Robert H → No 1 Mine; 1976-09-01 to 1977-05-24; source msha-controller-operator-history
- **controller_controls_operator:** Hubbard Robert H → Winjay Coal Company Inc; 1976-09-01 to 1977-05-24; source msha-controller-operator-history
- **operator_operates_mine:** Varney Brothers Coal Company → No 1 Mine; 1977-05-25 to 1977-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Varney Barry & Anthony-James Stevens → No 1 Mine; 1977-05-25 to 1977-11-16; source msha-controller-operator-history
- **controller_controls_operator:** Varney Barry & Anthony-James Stevens → Varney Brothers Coal Company; 1977-05-25 to 1977-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Lowe'S Branch Coal Company → No 1 Mine; 1977-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard Billy Ray & Alvis Lee Smith → No 1 Mine; 1977-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard Billy Ray & Alvis Lee Smith → Lowe'S Branch Coal Company; 1977-11-17 to current/open; source msha-controller-operator-history