# Relationship history for MSHA mine 4102296

Current hierarchy: **Grayson Charles → Charles Grayson Sand & Gravel → Woody Sand Pit #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ivan Tipton Sand & Gravel → Woody Sand Pit #1; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_mine:** Tipton Ivan Sand & Gravel → Woody Sand Pit #1; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **controller_controls_operator:** Tipton Ivan Sand & Gravel → Ivan Tipton Sand & Gravel; 1950-01-01 to 1979-04-09; source msha-controller-operator-history
- **operator_operates_mine:** Woody Sand Pit Company → Woody Sand Pit #1; 1979-04-10 to 1980-05-14; source msha-controller-operator-history
- **controller_controls_mine:** Woody Sand Pit Company → Woody Sand Pit #1; 1979-04-10 to 1980-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Woody Sand Pit Company → Woody Sand Pit Company; 1979-04-10 to 1980-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Charles Grayson Sand & Gravel → Woody Sand Pit #1; 1980-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Grayson Charles → Woody Sand Pit #1; 1980-05-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grayson Charles → Charles Grayson Sand & Gravel; 1980-05-15 to current/open; source msha-controller-operator-history