# Relationship history for MSHA mine 0800260

Current hierarchy: **Williams Gerald F → A B Williams Company → Marianna 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:** Anderson Sand Inc → Marianna Mine; 1950-01-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Anderson F C → Marianna Mine; 1950-01-01 to 1978-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Anderson F C → Anderson Sand Inc; 1950-01-01 to 1978-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Marianna Sand Inc → Marianna Mine; 1978-09-01 to 1980-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Dyson James H → Marianna Mine; 1978-09-01 to 1980-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Dyson James H → Marianna Sand Inc; 1978-09-01 to 1980-01-15; source msha-controller-operator-history
- **operator_operates_mine:** A B Williams Company → Marianna Mine; 1980-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Williams Gerald F → Marianna Mine; 1980-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Williams Gerald F → A B Williams Company; 1980-01-16 to current/open; source msha-controller-operator-history