# Relationship history for MSHA mine 3502969

Current hierarchy: **Darwin  Weathers → Weathers Crushing Inc → Cobleigh 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:** Darwin  Weathers → Cobleigh Pit; 1978-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Brown Road Sand & Gravel Inc → Cobleigh Pit; 1980-01-01 to 1981-01-21; source msha-controller-operator-history
- **controller_controls_mine:** William C  Sheppard → Cobleigh Pit; 1980-01-01 to 1981-01-21; source msha-controller-operator-history
- **controller_controls_operator:** William C  Sheppard → Brown Road Sand & Gravel Inc; 1980-01-01 to 1981-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Weathers Sand & Gravel → Cobleigh Pit; 1981-01-22 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_mine:** Gordon G  Weathers → Cobleigh Pit; 1981-01-22 to 1991-04-15; source msha-controller-operator-history
- **controller_controls_operator:** Gordon G  Weathers → Weathers Sand & Gravel; 1981-01-22 to 1991-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Weathers Crushing Inc → Cobleigh Pit; 1991-04-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darwin  Weathers → Weathers Crushing Inc; 1991-04-16 to current/open; source msha-controller-operator-history