# Relationship history for MSHA mine 0101701

Current hierarchy: **Fell H R Sr → Fell & Lawrence Inc → Montgomery Pit**

- 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:** Fell H R Sr → Montgomery Pit; 1976-01-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fell & Lawrence Inc → Montgomery Pit; 1977-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fell H R Sr → Fell & Lawrence Inc; 1977-04-01 to current/open; source msha-controller-operator-history