# Relationship history for MSHA mine 4103863

Current hierarchy: **Pannkuk Bobby Jr & Ronny Becknell → Terrell Sand Pit → TERRELL SAND 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 & B Sand & Gravel Inc → TERRELL SAND PIT; 1995-05-01 to 1996-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Vaughan Bill → TERRELL SAND PIT; 1995-05-01 to 1996-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Vaughan Bill → R & B Sand & Gravel Inc; 1995-05-01 to 1996-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Texas Sand → TERRELL SAND PIT; 1996-10-25 to 1998-10-21; source msha-controller-operator-history
- **controller_controls_mine:** Morrow Chub & Will → TERRELL SAND PIT; 1996-10-25 to 1998-10-21; source msha-controller-operator-history
- **controller_controls_operator:** Morrow Chub & Will → Texas Sand; 1996-10-25 to 1998-10-21; source msha-controller-operator-history
- **operator_operates_mine:** Terrell Sand Pit → TERRELL SAND PIT; 1998-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pannkuk Bobby Jr & Ronny Becknell → TERRELL SAND PIT; 1998-10-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pannkuk Bobby Jr & Ronny Becknell → Terrell Sand Pit; 1998-10-22 to current/open; source msha-controller-operator-history