Ringelmann smoke chart

smoke chart

machine record chart

record chart

Smoke and smoke control

smoke-exhausting and smoke-prevention

long play record {= LP record}

record-to-record travel

record-to-record travel algorithm

humid chart humidity chart

humidity chart humid chart

~(241)Am smoke detector source

‘Bai Jun Qing’ smoke agent

“Mushroom”smoke cloud

150 m smoke stack

241Am smoke detector source

a smoke-free policy

abatement of smoke

Acceleration Smoke