# Relationship history for MSHA mine 4103326

Current hierarchy: **Hanson PLC → Gifford-Hill & Company → No 16 Bryan**

- 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

- **controller_controls_mine:** Hanson PLC → No 16 Bryan; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Anderson Crushed Stone → No 16 Bryan; 1985-07-01 to 1986-12-08; source msha-controller-operator-history
- **controller_controls_mine:** Chennault Norman → No 16 Bryan; 1985-07-01 to 1986-12-08; source msha-controller-operator-history
- **controller_controls_operator:** Chennault Norman → Anderson Crushed Stone; 1985-07-01 to 1986-12-08; source msha-controller-operator-history
- **operator_operates_mine:** Double S Contractors → No 16 Bryan; 1986-12-09 to 1998-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Simon Tom Et Al → No 16 Bryan; 1986-12-09 to 1998-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Simon Tom Et Al → Double S Contractors; 1986-12-09 to 1998-04-23; source msha-controller-operator-history
- **operator_operates_mine:** Gifford-Hill & Company → No 16 Bryan; 1998-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Gifford-Hill & Company; 1998-04-24 to current/open; source msha-controller-operator-history