# Masks and blanks

Part ID: 1.20b · Layer 1 (Compute silicon & packaging) · child of 1.20

Photomasks and mask blanks that carry the circuit pattern projected onto a wafer during lithography.

## Companies

| Company | Role | Confidence | Ownership | Ticker | Note |
|---|---|---|---|---|---|
| DNP | manufacturer | inferred | public | 7912.T |  |
| Hoya | manufacturer | inferred | public | 7741.T |  |
| Photronics | manufacturer | inferred | public | PLAB |  |
| Toppan | manufacturer | inferred | public | 7911.T |  |

Confidence tags: disclosed = company/filing statement; reported = trade press or partner list; inferred = taxonomy lead.