# Relationship history for MSHA mine 1514987

Current hierarchy: **Bolender Daniel J & Gregory K Collins → Shannaco → Shannaco Dredge & Process**

- 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:** Marimpex Inc → Shannaco Dredge & Process; 1984-11-01 to 1985-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Jimmy D  Kulbeth → Shannaco Dredge & Process; 1984-11-01 to 1985-06-12; source msha-controller-operator-history
- **controller_controls_operator:** Jimmy D  Kulbeth → Marimpex Inc; 1984-11-01 to 1985-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Bolender Daniel J & Gregory K Collins → Shannaco Dredge & Process; 1985-01-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Shannaco → Shannaco Dredge & Process; 1985-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolender Daniel J & Gregory K Collins → Shannaco; 1985-06-13 to current/open; source msha-controller-operator-history