# Relationship history for MSHA mine 0101304

Current hierarchy: **A G  Snowden → Rocart Sand Company → HOWELLS FERRY 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:** Rocart Sand Company → HOWELLS FERRY PIT; 1950-01-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_mine:** John  Waddell → HOWELLS FERRY PIT; 1950-01-01 to 1990-10-31; source msha-controller-operator-history
- **controller_controls_operator:** John  Waddell → Rocart Sand Company; 1950-01-01 to 1990-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Rocart Sand Company → HOWELLS FERRY PIT; 1990-11-01 to 1991-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Jesse W  Carpenter → HOWELLS FERRY PIT; 1990-11-01 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jesse W  Carpenter → Rocart Sand Company; 1990-11-01 to 1991-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Rocart Sand Company → HOWELLS FERRY PIT; 1991-12-01 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Wendell D  Welles → HOWELLS FERRY PIT; 1991-12-01 to 1995-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Wendell D  Welles → Rocart Sand Company; 1991-12-01 to 1995-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Rocart Sand Company → HOWELLS FERRY PIT; 1995-08-01 to 1998-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jesse W  Carpenter → Rocart Sand Company; 1995-08-01 to 1998-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Rocart Sand Company → HOWELLS FERRY PIT; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** A G  Snowden → HOWELLS FERRY PIT; 1999-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A G  Snowden → Rocart Sand Company; 1999-01-01 to current/open; source msha-controller-operator-history