# Relationship history for MSHA mine 0800038

Current hierarchy: **Layne Dredging Company → C & L Dredging Company → Dimar 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:** Hollywood Quarries Inc → Dimar Pit; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Serianni Charles → Dimar Pit; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Serianni Charles → Hollywood Quarries Inc; 1950-01-01 to 1984-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Hollywood Quarries Inc → Dimar Pit; 1984-07-01 to 1987-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Henry Robert R → Dimar Pit; 1984-07-01 to 1987-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Henry Robert R → Hollywood Quarries Inc; 1984-07-01 to 1987-10-05; source msha-controller-operator-history
- **operator_operates_mine:** Hendry C & L Dredging → Dimar Pit; 1987-10-06 to 1988-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Kinzly Les & Richard N Lundgren → Dimar Pit; 1987-10-06 to 1988-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Kinzly Les & Richard N Lundgren → Hendry C & L Dredging; 1987-10-06 to 1988-10-18; source msha-controller-operator-history
- **operator_operates_mine:** C & L Dredging Company → Dimar Pit; 1988-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Layne Dredging Company → Dimar Pit; 1988-10-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Layne Dredging Company → C & L Dredging Company; 1988-10-19 to current/open; source msha-controller-operator-history