# Relationship history for MSHA mine 3606101

Current hierarchy: **Lucas Emil → Fw & Rr Inc → Fw & Rr Strip**

- 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:** Fw & Rr Inc → Fw & Rr Strip; 1976-04-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Walter Floyd E → Fw & Rr Strip; 1976-04-01 to 1983-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Walter Floyd E → Fw & Rr Inc; 1976-04-01 to 1983-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Fw & Rr Inc → Fw & Rr Strip; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lucas Emil → Fw & Rr Strip; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lucas Emil → Fw & Rr Inc; 1983-06-01 to current/open; source msha-controller-operator-history