# Relationship history for MSHA mine 4502610

Current hierarchy: **Walt  Miles → Miles Sand & Gravel Co Inc → Shotwell 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:** Walt  Miles et al → Shotwell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lillian M  Shotwell → Shotwell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J D Shotwell Company → Shotwell Pit; 1979-01-01 to 1995-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Lillian M  Shotwell → J D Shotwell Company; 1979-01-01 to 1995-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Miles Sand & Gravel Co Inc → Shotwell Pit; 1995-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Walt  Miles et al → Miles Sand & Gravel Co Inc; 1995-04-04 to current/open; source msha-controller-operator-history