# Relationship history for MSHA mine 4102192

Current hierarchy: **Walker Glen → Glen Walker → Freestone County Pits**

- 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:** C & F Equipment Company → Freestone County Pits; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Owens Clarence L & Richard P → Freestone County Pits; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Owens Clarence L & Richard P → C & F Equipment Company; 1950-01-01 to 1980-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Glen Walker → Freestone County Pits; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Walker Glen → Freestone County Pits; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walker Glen → Glen Walker; 1980-04-01 to current/open; source msha-controller-operator-history