Comated Edilizia S.p.A.
Italian manufacturer of double-locking wedge clamps, self-locking spring clamps, anchor systems, couplers and other accessories for the construction market.
http://www.comated.com

Key-Less-Locking Mechanism
Knollan is a startup company that has completed the development of a very innovative locking mechanism. This mechanism is suitable for all kinds of locks, and for any security level, while offering many additional advantages over existing locks. The Knollan mechanism resembles the idea of a combination lock, but it is unique and entirely different from any existing locking device. It has many special features that lead to commercial strengths, if not market superiority, over existing locking mechanism.
http://www.knollan.com

U.S. Meter Fit Corporation
Manufactured Gas By-pass locking Meter Sets in various sizes ranging from 1.5 million cfh. to 23 million cfh. Products have three locking valves allowing the ability to proof meters without losing service and avoiding re-lights.
http://usmeterfit.com

Catalina Cylinders
Catalina Cylinders is an industry leading manufacturer of quality high and low pressure aluminum compressed gas cylinders.
http://www.catalinacylinders.com/

Illinois Pneumatics
Illinois Pheumatics designs and manufacturers pneumatic cylinders. Illinois Pneumatics prides itself in modifying standard cylinders for special use.
http://www.illpneumatics.com/

Custom Cylinders International Incorporated
customcylindersintinc.com is the offical web page for Custom Cylinders International Incorporated, Mico Machining, and Custom Cylinder Repair Service
http://www.customcylindersintinc.com/

Rototechnix
Rototechnix, leader in rotary tooling and rotary die-cutting presents a large range of die-cutting cylinders, printing cylinders and hot foil stamping dies.
http://www.rototechnix.com/

Custom Cylinders International
customcylindersintinc.com is the offical web page for Custom Cylinders International Incorporated, Mico Machining, and Custom Cylinder Repair Service
http://www.customcylindersintinc.com

The "Double-Checked Locking is Broken" Declaration
Details on the reasons - some very subtle - why double-checked locking cannot be relied upon to be safe. Signed by a number of experts, including Sun engineers.
http://www.cs.umd.edu/~pugh/java/memoryModel/DoubleCheckedLocking.html

Electronic Locking Systems
Electronic security systems including electro magnetic locks, key pad entry, proximity readers, solenoid bolts and electric release systems or strikes for use in access control and electronic locking applications.
http://www.electriclock.net/