Smart Pendulum
Java applet explores a pendulum with rope of variable length. The solution implements 4-th order Runge-Kutta method for differential equations.
http://odin.prohosting.com/~evgenik1/pend.htm

Bergner Metalurgica
Manufacturer of compressor (piston type) spare parts: Valves, piston rod packings, scraper rings, PTFE piston rings, for Ateliers Francois, ABC, Belliss and Morcom and other compressors.
http://www.bergner.com.ar/

Pendulum Energy
Pendulum Energy has helped its clients map out processes and streamline those processes key to increasing productivity and profitability
http://www.pendulumenergy.com

The Simple Plane Pendulum
This applet illustrates the simple plane pendulum, with or without damping. The user enters the damping coefficient and initial conditions, and the applet animates the pendulum's motion and plots the angular velocity versus the angle. Such a plot is called a phase portrait.
http://www.iopb.res.in/~vshenoi/scienceday/fundemoapplets/JAVA/pendulum/pendulum2.html

Burckhardt Compression
Burckhardt Compression - Your partner for reciprocating compressors: labyrinth piston compressors, process gas compressors (API618), hyper compressors, quality compressor components, condition monitoring and all services.
http://www.burckhardtcompression.com

Orbiting Piston
Patented, innovative rotary internal combustion engine which orbits instead of rotates and has piston like chamber action. Includes theoretical and technical background, specifications, diagrams and patent.
http://home.woh.rr.com/opengine

Piston-rings.eu
Offers piston rings for vehicles and industrial engines. Includes product catalogue and company profile.
http://www.piston-rings.eu

Dynex/Rivett Inc.
A profile of Dynex/Rivett and its high pressure hydraulic products rated from 6000 psi (420 bar) to 20,000 psi (1400 bar), including hydraulic piston pumps, power units, hydraulic valves, hydraulic piston and vane motors, electrohydraulic controls and hydraulic actuators.
http://www.dynexhydraulics.com/

Combined Fluid Products
Vacuum pumps: Combined Fluid Products offers vacuum pump, vacuum pumps, air knife, air knives, and air knife drying.
http://www.combinedfluidproducts.com/

Ophioglossum pendulum
Photographic image.
http://www.botany.hawaii.edu/faculty/carr/images/oph_pen.jpg