double crank mechanism top right preview
equal spacing adjustment right preview
Reversing-friction-drive
Rotary-sealing-joint
Rotary-fluid-connector
Adjustable-angle-external-gear-drive
Adjustable-angle-gear-drive
Spur-gear-differential
Helical-groove-cam-gear
Dual-stroke-cam-ratchet
Wall-through-bevel-drive
Stepped-cam-ratchet
Rotary-grain-dispenser
Needle-capture-mechanism
Spoiler-actuation-linkage
Helical-groove-barrel-cam-drive
Cam-driven-sliding-panel
Crank-driven-lifting-and-rotating-table
Spherical-ring-drive-coupler
Spherical-coulisse-follower
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Frequently Asked Questions

Yes, you can upgrade or change your plan at any time through Memberships page. Once you switch, the new plan takes effect immediately, and your billing cycle and renewal date will reset based on the date of the change.
When you upgrade or renew, your download quota resets according to your new plan.
Therefore, you can use up your download quota before renewal. Previous unused downloads do not roll over to the new plan.

No, repeated downloads of the same file count as one single download within your quota. You can re-download the downloaded files freely during one active subscription period without affecting your remaining balance.

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