# Relationship history for MSHA mine 4002212

Current hierarchy: **Cook Frank & Ralph Turner → Smith Branch Coal Company → Mine #1**

- 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:** Smith Branch Coal Company → Mine #1; 1977-03-01 to 1981-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Bolden Scotty R--Rosevelt Armes Et Al → Mine #1; 1977-03-01 to 1981-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Bolden Scotty R--Rosevelt Armes Et Al → Smith Branch Coal Company; 1977-03-01 to 1981-11-08; source msha-controller-operator-history
- **operator_operates_mine:** Smith Branch Coal Company → Mine #1; 1981-11-09 to 1985-03-26; source msha-controller-operator-history
- **controller_controls_mine:** Cook Frank → Mine #1; 1981-11-09 to 1985-03-26; source msha-controller-operator-history
- **controller_controls_operator:** Cook Frank → Smith Branch Coal Company; 1981-11-09 to 1985-03-26; source msha-controller-operator-history
- **operator_operates_mine:** Smith Branch Coal Company → Mine #1; 1985-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cook Frank & Ralph Turner → Mine #1; 1985-03-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cook Frank & Ralph Turner → Smith Branch Coal Company; 1985-03-27 to current/open; source msha-controller-operator-history