We found 4 dictionaries that define the word fr 4:

General (2 matching dictionaries)

1. FR-4: Wikipedia, the Free Encyclopedia
2. FR-4: Stammtisch Beau Fleuve Acronyms

Computing (1 matching dictionary)

3. FR-4: Encyclopedia

Tech (1 matching dictionary)

4. FR-4: Printed Circuit Design and Manufacturing Glossary

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