section a-a a-a

Pit-in-pit

A-A-A conjugation structure

S-A(A-A) missile

A.A.A.

affix a seal

characters on a seal carved in relief

cord on a seal

Dopplerite built-in seal coat

face seal seal joint

inter pressurized seal in vacuum with double rubber gaskets

main shaft seal in pumped storage power station

ribbon for a seal

SEAL IN

seal in alloy

seal in coil

seal in switch

seal-in relay

seal-in(electrical circuit)