# Relationship history for MSHA mine 3304360

Current hierarchy: **Brent  Gerken; Michael J  Gerken → Seaway Sand & Stone Inc → SEAWAY SAND & STONE**

- 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

- **controller_controls_mine:** Mack S  Moon → SEAWAY SAND & STONE; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seaway Sand & Stone Inc → SEAWAY SAND & STONE; 1995-10-01 to 1997-12-21; source msha-controller-operator-history
- **controller_controls_operator:** Mack S  Moon → Seaway Sand & Stone Inc; 1995-10-01 to 1997-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Seaway Sand & Stone Inc → SEAWAY SAND & STONE; 1997-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brent  Gerken et al → SEAWAY SAND & STONE; 1997-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Gerken et al → Seaway Sand & Stone Inc; 1997-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael J  Gerken et al → Seaway Sand & Stone Inc; 1997-12-22 to current/open; source msha-controller-operator-history