# C10 · Graphite industrial clue

## Boundary

No battery disassembly, powder handling or pencil composition claim comes from this card.

## Complete source

A fictional electronics exhibition uses a source-labelled text card F5. The 2017 USGS publication describes graphite properties relevant to electronics and lubricants. No mine/rank or current-market data is adopted.

## Id

C10

## Invitation

Give one source-described use relationship for the exhibition reader.

## Next try

Ask for a more specific safely readable product-source label instead of guessing every device contains natural graphite.

## Ordinary possible response

F5 links graphite properties with industrial uses; the exhibit is a text explanation, not a working device.

## Title

Graphite industrial clue