# Relationship history for MSHA mine 1101848

Current hierarchy: **O E Hulse III → Powley Sand & Gravel-Div/Seneca Petroleum Co Inc → Powley Gravel 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** C A Powley Company → Powley Gravel Pit; 1950-01-01 to 1986-03-03; source msha-controller-operator-history
- **controller_controls_mine:** C A  Powley → Powley Gravel Pit; 1950-01-01 to 1986-03-03; source msha-controller-operator-history
- **controller_controls_operator:** C A  Powley → C A Powley Company; 1950-01-01 to 1986-03-03; source msha-controller-operator-history
- **operator_operates_mine:** Powley Sand & Gravel → Powley Gravel Pit; 1986-03-04 to 1991-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Joseph E Powley → Powley Gravel Pit; 1986-03-04 to 1991-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph E Powley → Powley Sand & Gravel; 1986-03-04 to 1991-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Powley Sand & Gravel-Div/Seneca Petroleum Co Inc → Powley Gravel Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** O E Hulse III  et al → Powley Gravel Pit; 1991-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** O E Hulse III  et al → Powley Sand & Gravel-Div/Seneca Petroleum Co Inc; 1991-05-01 to current/open; source msha-controller-operator-history