...Technologies Ltd Stroud, Gloucestershire UK ...suppliers Hollow Shaft Encoders More suppliers Hollow Shaft Incremental Encoders More suppliers Hour Counting Timers More suppliers Incremental Encoders More suppliers Inductive Proximity...
http://electronics.zibb.co.uk/research/Hour+Counting+Timers
...output • MS connector (side or end) available • Two accuracy grades DATASHEET Models 8x35H hollow shaft incremental encoders • 3.5" dia x 2.4" long body; fits shafts up to 1.20" dia • Internal bellows-type precision...
http://www.gpi-encoders.com/rotinc.htm
...Model M6-4, M6-5, M6-6 and M6-7 are Hollow Shaft Incremental Encoders (also known as tachometers or pulse generators...similar to the model M4 Heavy Mill Duty rotary hollow shaft incremental encoders but utilize flameproof and increased safety...
http://www.avtron.com/pdf/encoders/m6.4,7.pdf