# Relationship history for MSHA mine 0100576

Current hierarchy: **Ingram Lewis A → Ingram'S Gravel Inc → PIT #1**

- 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:** Southern Stone Company Inc → PIT #1; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Southern Industries Inc → PIT #1; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Southern Industries Inc → Southern Stone Company Inc; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Southern Stone Company Inc → PIT #1; 1979-06-01 to 1986-12-03; source msha-controller-operator-history
- **controller_controls_mine:** Dravo Corp → PIT #1; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dravo Corp → Southern Stone Company Inc; 1979-06-01 to 1986-12-03; source msha-controller-operator-history
- **operator_operates_mine:** Ingram'S Gravel Inc → PIT #1; 1986-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ingram Lewis A → PIT #1; 1986-12-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ingram Lewis A → Ingram'S Gravel Inc; 1986-12-04 to current/open; source msha-controller-operator-history