# Relationship history for MSHA mine 4104355

Current hierarchy: **James E  Cox → Kirby Stone Company LLC → Rock Quarry II**

- 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:** Kirby Stone Co. II → Rock Quarry II; 2002-04-09 to 2004-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Weldon  Kirby → Rock Quarry II; 2002-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Weldon  Kirby → Kirby Stone Co. II; 2002-04-09 to 2004-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Kirby Stone Company LLC → Rock Quarry II; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James E  Cox → Rock Quarry II; 2005-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James E  Cox → Kirby Stone Company LLC; 2005-01-01 to current/open; source msha-controller-operator-history