What kind of shingles are these

[jcartwright (Jonathan "Katie" Cartwright, CMI IOS.962-MAS)]

I saw these shingles and have not seen them before. The pattern is not regularly seen in the neighborhood I was in.

I wanted to do some searching for additional information about them if someone could point me in the right direction.

Thanks much and have a great evening.

Jonathan

[sstanczyk (Stephen Stanczyk, WA License #221)]

http://www.roofhelp.com/interlocking_shingles.htm

[jjonas (Jeffrey Jonas)]

http://www.iko.com/shared/residential/installation/3ULI.pdf

[Frank_Albert]

‘T-Locks’.

http://www.coloradoroofing.com/t-lock-roofs-getting-replaced-for-free.html

[cvilt (Curtis M. Vilt)]

Haven’t seen them in years

[gromicko (Nick Gromicko, CMI)]

Bottom of http://www.nachi.org/asphalt-comp-shingles-part6-60.htm

[krunquist (Keith Runquist)]

T-Locs. 1/2 the houses here have them. Great in the wind. Hard to install corretly.