# Relationship history for MSHA mine 2301848

Current hierarchy: **Casady C D → Swinging Bridge Inc → Swinging Bridge Incorporated**

- 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:** Trappist Concrete Products → Swinging Bridge Incorporated; 1981-06-01 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Matter Robert → Swinging Bridge Incorporated; 1981-06-01 to 1986-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Matter Robert → Trappist Concrete Products; 1981-06-01 to 1986-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Swinging Bridge Inc → Swinging Bridge Incorporated; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Casady C D → Swinging Bridge Incorporated; 1986-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Casady C D → Swinging Bridge Inc; 1986-11-01 to current/open; source msha-controller-operator-history