Ashland Multipoint Hardware
ASHLAND has a concealed rod version used by Marvin and Jeldwen, They also have a edge mount version used by Caradco and others.
Ashland Hardware for Multipoint Locks
There are 3 possible locks.
1. Single Point lock-This has a spring latch and deadbolt at the handle position, no other locking points.
2. Multipoint lock with shootbolts-This has metal that runs the length of the door edge. Vertical locking points at top and bottom of door.
3. Multipoint lock with concealed rods-This has rods that runs the length of the door, but are not seen on the edge. Vertical locking points at top and bottom of door.
23 Products
4991637
Mortise Lock, Multi-Point with concealed rods, Active 60/92 - MarvinMultipoint Mortise Lock
4991633
Active Concealed Rod, 60/92 Mortise Lock, No Faceplate - PGT5/16-18 Thread Rod - PGT
4991629
Active Concealed Rod 60/92 , 5/16-18 Thread, Radius Faceplate AttachedActive 2-3/8" Backset, 5/16-18 Thread 
4991630
Active Concealed Rod 60/92 , Radius Faceplate AttachedActive 2-3/8" Backset & 1/4-20 Thread
4991635
Active Concealed Multi-point lock Rod , 70/92 Radius Faceplate Attached PeachtreeActive 70mm Multipoint Lock, 2-3/4 backset 
4991631
Active Concealed Rod Version 60mm Mortise Lock - Square FaceActive Door Mortise Lock
4991330
Ashland XP25 3 point Shootbolt Multipoint Lock, 60mm backset, 20mm faceplate Square EndsAshland Multipoint Lock
40161
Mortise Latch and Deadbolt Face Plate, Lock cover 7/8" x 11" - Stainless SteelMortise Lock Face Plate Cover
W1041-30S1
Replacement Shootbolt Tip, Square Shape, 1/4-20 thread for concealed MPL - 2"Replacement Shootbolt Tip
395034
Ashland Tail Piece Assembly for 1-3/4 or 2-1/4" Thick DoorAshland Tailpiece Assembly
W1041-32P
Shootbolt Guide for wood application, Square Shape TipShootbolt Guide, Square Shape