# Relationship history for MSHA mine 3603179

Current hierarchy: **Akins Dale → Frankstown Sand Inc → Frankstown Sand 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:** Frankstown Sand Supply → Frankstown Sand Incorporated; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_mine:** Altmanshofer Robert G → Frankstown Sand Incorporated; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **controller_controls_operator:** Altmanshofer Robert G → Frankstown Sand Supply; 1950-01-01 to 1981-06-03; source msha-controller-operator-history
- **operator_operates_mine:** Frankstown Sand Inc → Frankstown Sand Incorporated; 1981-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Akins Dale → Frankstown Sand Incorporated; 1981-06-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Akins Dale → Frankstown Sand Inc; 1981-06-04 to current/open; source msha-controller-operator-history