Ordtech electromechanical intervalometer for 2.75 inch Rocket Launchers is the only known, currently in production intervalometer which meets or exceeds standard MIL-S-85377

For 7-tube launchers 2.75 inch equivalent to 356AS172-1	For 19-tube launchers 2.75 inch equivalent to 356AS172-2
NSN: 1340-00-157-5917	NSN: 1340-00-390-3885