# Relationship history for MSHA mine 0100600

Current hierarchy: **Lewis James → River City Industries → Sumter County Pit No I**

- 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:** River City Industries → Sumter County Pit No I; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Thibodeaux E L → Sumter County Pit No I; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Thibodeaux E L → River City Industries; 1950-01-01 to 1979-05-31; source msha-controller-operator-history
- **operator_operates_mine:** River City Industries → Sumter County Pit No I; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lewis James → Sumter County Pit No I; 1979-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lewis James → River City Industries; 1979-06-01 to current/open; source msha-controller-operator-history