For what is the C series of paper sizes used?
Envelope sizes 🖂 No 10 Envelope ✉ Envelope ENVELOPES Envelope size No. 10 Envelope Envelopes Envelope manufacture ISO 269 ISO 269:1985
envelope manufacture iso 269 1985 envelope size envelope sizes ✉ 🖂 no 10 envelope envelopes envelope iso 269
envelopes
WikipediaEntity
ENVELOPES