# Relationship history for MSHA mine 5001691

Current hierarchy: **Ahtna Inc → Ahtna Construction & Primary Products Corporation → Ahtna Constr & Primary Prods Corp**

- 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:** Ahtna Construction & PPC → Ahtna Constr & Primary Prods Corp; 2001-04-01 to 2008-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ahtna Inc → Ahtna Constr & Primary Prods Corp; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ahtna Inc → Ahtna Construction & PPC; 2001-04-01 to 2008-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Ahtna Contractors LLC → Ahtna Constr & Primary Prods Corp; 2009-01-01 to 2016-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Ahtna Inc → Ahtna Constr & Primary Prods Corp; 2009-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ahtna Inc → Ahtna Contractors LLC; 2009-01-01 to 2016-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Ahtna Construction & Primary Products Corporation → Ahtna Constr & Primary Prods Corp; 2016-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ahtna Inc → Ahtna Construction & Primary Products Corporation; 2016-07-25 to current/open; source msha-controller-operator-history