# Relationship history for MSHA mine 1100479

Current hierarchy: **Jack E  Boehm → Boehm Brothers Inc → Boehm No 2 Pit**

- 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:** Streator Brick Systems Inc → Boehm No 2 Pit; 1950-01-01 to 1981-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Bruce  Mallonee → Boehm No 2 Pit; 1950-01-01 to 1998-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Mallonee → Streator Brick Systems Inc; 1950-01-01 to 1981-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Jack E  Boehm → Boehm No 2 Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Boehm Brothers Inc → Boehm No 2 Pit; 1981-11-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jack E  Boehm → Boehm Brothers Inc; 1981-11-30 to current/open; source msha-controller-operator-history