# Relationship history for MSHA mine 4700040

Current hierarchy: **Ivan  Bowen III; Ivan Maxwell  Bowen IV → Dresser Trap Rock Inc. → Dresser Trap Rock 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Bryan Dresser Trap Rock Inc → Dresser Trap Rock Incorporated; 1950-01-01 to 1979-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Dresser Trap Rock Inc → Dresser Trap Rock Incorporated; 1950-01-01 to 1979-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Dresser Trap Rock Inc → Bryan Dresser Trap Rock Inc; 1950-01-01 to 1979-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Dresser Trap Rock Inc. → Dresser Trap Rock Incorporated; 1979-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ivan  Bowen III → Dresser Trap Rock Incorporated; 1979-12-01 to 2019-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Ivan  Bowen III → Dresser Trap Rock Inc.; 1979-12-01 to 2019-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Ivan Maxwell  Bowen IV et al → Dresser Trap Rock Incorporated; 2019-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ivan Maxwell  Bowen IV et al → Dresser Trap Rock Inc.; 2019-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ivan  Bowen III et al → Dresser Trap Rock Inc.; 2019-04-22 to current/open; source msha-controller-operator-history