# Relationship history for MSHA mine 4104936

Current hierarchy: **Ronald Lee  Pray; Debra Lee  Pray → Cannon Materials, LLC → CANNON 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

- **operator_operates_mine:** R & W Sand & Gravel → CANNON PIT; 2012-04-02 to 2015-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Wayne  Martin → CANNON PIT; 2012-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wayne  Martin → R & W Sand & Gravel; 2012-04-02 to 2015-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Cannon Materials, LLC → CANNON PIT; 2015-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Debra Lee  Pray et al → CANNON PIT; 2015-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Debra Lee  Pray et al → Cannon Materials, LLC; 2015-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald Lee  Pray et al → Cannon Materials, LLC; 2015-07-21 to current/open; source msha-controller-operator-history