# Relationship history for MSHA mine 1201923

Current hierarchy: **Sides Brack Jr → Sidco Inc → Knox County Pit #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

- **controller_controls_mine:** Union Miniere S A → Knox County Pit #1; 1981-07-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Union Mines Inc → Knox County Pit #1; 1983-11-01 to 1984-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Union Miniere S A → Knox County Pit #1; 1983-11-01 to 1984-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Union Miniere S A → Union Mines Inc; 1983-11-01 to 1984-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Freelandville Coal Company Inc → Knox County Pit #1; 1984-10-25 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_mine:** White Herman → Knox County Pit #1; 1984-10-25 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_operator:** White Herman → Freelandville Coal Company Inc; 1984-10-25 to 1986-10-14; source msha-controller-operator-history
- **controller_controls_mine:** Sides Brack Jr → Knox County Pit #1; 1986-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bicknell Minerals Inc → Knox County Pit #1; 1986-10-15 to 1987-01-30; source msha-controller-operator-history
- **controller_controls_operator:** Union Miniere S A → Bicknell Minerals Inc; 1986-10-15 to 1987-01-30; source msha-controller-operator-history
- **operator_operates_mine:** Sidco Inc → Knox County Pit #1; 1987-01-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sides Brack Jr → Sidco Inc; 1987-01-31 to current/open; source msha-controller-operator-history